This is the compendium of TRICKLE-L digests for October 1996.
It was prepared from the daily digest mailings. Some digests
may be missing, because occasional mailings are lost en route.
Contents: JOB ANNOUNCEMENT: Technical Services Representative (Jerome Pier .<.jpier@interramp.com.>.) <---------------------------------------------------------------------->
Date: Tue, 01 Oct 1996 08:41:37 -0700 From: Jerome Pier .<.jpier@interramp.com.>. Subject: JOB ANNOUNCEMENT: Technical Services Representative Position Announcement Technical Service Representative Netafim Irrigation, a leading manufacturer of drip irrigation equipment has an outstanding opportunity for a Technical Services Representative to be based in Fresno, California. In this position, the individual will provide technical support to Customer Service and field sales personnel as well as conducting various product research and evaluation functions. Individual will also play a key role in the production of technical publications. Associated duties will include product training and assisting in the development of product line marketing plans. The ideal candidate will possess: 7 Exceptional problem solving skills 7 Above average communication skills in both verbal and written form 7 Basic skill with MS Windows applications. Experience with CAD is desirable 7 Above average organizational skills 7 Ability to give presentations in a group setting 7 Strong desire to assist others 7 Background in fluid mechanics or hydraulics. Irrigation experience desired but not required Netafim Irrigation is an equal opportunity employer committed to providing an environment for personal growth and development. We offer an excellent benefit package and a stimulating team environment. Interested applicants should submit appropriate information to: Netafim Irrigation, Inc. Technical Services Position 4974 E Clinton Way, Suite 125 Fresno, CA 93727 Fax: (209) 453-6803 No phone calls please <------------------------------>
End of Digest ************************
Contents: Re: JOB ANNOUNCEMENT: Technical Services Representative (Farhad Fassihi .<.farhad@behzad.ntu.ac.uk.>.) <---------------------------------------------------------------------->
Date: Wed, 02 Oct 1996 18:37:27 +0100 From: Farhad Fassihi .<.farhad@behzad.ntu.ac.uk.>. Subject: Re: JOB ANNOUNCEMENT: Technical Services Representative Jerome Pier wrote: > > Position Announcement > Technical Service Representative > >Hi Jerome, I saw your message. I am currently a lecturer in Polymer process Engineering. I am a manufacturing engineer with background in electrical, Mechanical and polymer processing. I am interested in the problems faced in Drip Irrigation especially those encountered during manufacture of the relevant equipment. I am based at Nottingham-England. I am looking for something commercio-technical! in industry. Do I have a chance? Is your vacancy appropriate for someone like myself? What sort of a renumeration package is on offer? <------------------------------>
End of Digest ************************
Contents:
RECYCLE PVC ("KEVIN B. BRONSON" .<.103644.2426@CompuServe.COM.>.)
Re: RECYCLE PVC (Farhad Fassihi .<.farhad@behzad.ntu.ac.uk.>.)
unscribe (ccarter@gumbo.bae.lsu.edu (Cade Carter))
unsubscribe (jeetu@hsmpk12a-55.eng.sun.com (Jeetendra Jangle))
Re: RECYCLE PVC (flatman@ix.netcom.com (Rick Peeren))
unsubsribe (Doug Burch .<."doug@clandjop.com"@clandjop.com.>.)
<---------------------------------------------------------------------->
Date: 03 Oct 96 00:02:51 EDT
From: "KEVIN B. BRONSON" .<.103644.2426@CompuServe.COM.>.
Subject: RECYCLE PVC
Trickle L Members:
Does anyone know of a way to recycle used PVC pipe that has been pulled from the
ground after an old sprinkler system has been abandoned? Is anyone recycling
drip tape or drip hose? I have customers interested in reducing waste.
Kevin Bronson
Weimer Irrigation & Supply, Inc.
6061N Winton Way
Winton, CA 95388
Voice (209)358-1443
Fax (209)358-1444
<------------------------------>
Date: Thu, 03 Oct 1996 13:32:20 +0100
From: Farhad Fassihi .<.farhad@behzad.ntu.ac.uk.>.
Subject: Re: RECYCLE PVC
KEVIN B. BRONSON wrote:
>
> Trickle L Members:
>
> Does anyone know of a way to recycle used PVC pipe that has been pulled from the
> ground after an old sprinkler system has been abandoned? Is anyone recycling
> drip tape or drip hose? I have customers interested in reducing waste.
>
>
This is an interesting question. There are a lot of people who are
trying to make us believe that recycling is the only thing we could do
with used plastics. Unfortunately most of these people are either
politicians or social scientists!
In order to recycle a material you need to know what is the end product
and assess the suitability of the recycled material for your
application. Let's assume you have done this already. Next, you need to
collect them. That means usually send the tractors or workers on the
ground to get them from the field. Use diesel fuel to transport them to
the appropriate location. Spend energy(heat), water,
chemicals(detergents) to clean it. Then if you are lucky and have dryers
and shreders/granulators at the same site, get them through all these
stages, before you can use them.
As you can see, you are using a lot of energy (dare I say harming the
environment!) to produce something that is low quality.
The best possible use of such material is burning it to reclaim the
thermal energy.
Failing that and when it is a requirement to recycle these materials,
certain things need to be considered.
How far a field do you need to travel to collect your scraps?
How much energy do you spend to separate scrap PVC from other
contaminating substances.
What range of material do you have to recycle, i.e. do you collect PE,
PP and other materials when you are collecting the tubing as part of it
How much in demand would your recycled material be at the end of your
process.
I am sure enough people in your neck of the woods will be to give you
some help and advice.
I hope this have been of some use.
Farhad.
<------------------------------>
Date: Thu, 3 Oct 96 12:34:32 CDT
From: ccarter@gumbo.bae.lsu.edu (Cade Carter)
Subject: unscribe
unsubscribe ccarter@gumbo.bae.lsu.edu
<------------------------------>
Date: Thu, 3 Oct 1996 11:10:08 -0700
From: jeetu@hsmpk12a-55.eng.sun.com (Jeetendra Jangle)
Subject: unsubscribe
unsubscribe jeetu@eng.sun.com
<------------------------------>
Date: Thu, 3 Oct 1996 16:13:05 -0700
From: flatman@ix.netcom.com (Rick Peeren)
Subject: Re: RECYCLE PVC
You wrote:
>
>Trickle L Members:
>
>Does anyone know of a way to recycle used PVC pipe that has been
pulled from the
>ground after an old sprinkler system has been abandoned? Is anyone
recycling
>drip tape or drip hose? I have customers interested in reducing waste.
>
>Kevin Bronson
>Weimer Irrigation & Supply, Inc.
>6061N Winton Way
>Winton, CA 95388
>Voice (209)358-1443
>Fax (209)358-1444
>
>Kevin
I heard that Bairos Recycling in Fresno might be recycling drip tape
and tubing, but I am very unsure of PVC. Their number is 209-233-0922.
Hope this helps.
Rick Peeren
IrriChem Sales
<------------------------------>
Date: Thu, 03 Oct 1996 22:23:57 -0700
From: Doug Burch .<."doug@clandjop.com"@clandjop.com.>.
Subject: unsubsribe
unsubscribe doug@clandjop.com
<------------------------------>
End of Digest
************************
Contents: Job Posting (Ingvard Find .<.76421.145@CompuServe.COM.>.) <---------------------------------------------------------------------->
Date: 04 Oct 96 00:29:02 EDT From: Ingvard Find .<.76421.145@CompuServe.COM.>. Subject: Job Posting JOB OPENING POSITION: Irrigation Technical Marketing Specialist (International Ag Division) DIVISION: Rain Bird International, Inc. REPORTS TO: Ingvard Find, International Ag Brand Manager JOB DESCRIPTION: The Technical Marketing Specialist is responsible for assisting the International Brand Manager with technical product information, technical problem issues, and new product introduction. In addition, the person will organize promotional programs and coordinate NPD, market research and customer service on technical issues related to irrigation in global agricultural markets. JOB RESPONSIBILITIES: . Technical support for inside and outside sales staff and customers. -Provide technical support to field service, sales, marketing engineering and manufacturing. -Provide the market with technical product information and product updates. . Assist with strategic planning as related to direction and marketing plans. . Product presentation to sales force and customers. . Assist the SBU with development and management of product support materials. . Development of technical sales material and programs for the sales staff. MINIMUM QUALIFICATION: An undergraduate degree in engineering or agronomy with 2-5 years of technical sales, marketing or other business experience. A service minded person with ability to emphasize product quality. Strong verbal and written skills required. Skilled and familiar with MS Office, Pagemaker and other PC software. Willingness to travel as business develops. Ability to interface with people of various backgrounds and nationalities. Must be self-motivated and willing to take responsibility for projects and problem solving. DESIRABLE QUALIFICATIONS: Proficient in a foreign language (Spanish, French Mandarin or Japanese). International business or overseas living and working experience highly desirable. Previous irrigation experience in agriculture or related fields an advantage. Also a strong desire to advance into Product Management / Marketing Management. An advanced degree in business management or engineering preferred. OTHER INFORMATION: Submit resumes and applications to: Ingvard Find, Rain Bird International, Inc. Fax 818 963 4287, ASAP No phone calls please. <------------------------------>
End of Digest ************************
Contents:
GROUNDWATER Listserv (kenbannister@groundwater.com (Kenneth E. Bannister))
UNSUBSCRIBE Robert E. Chapman, Jr. ("Robert E. Chapman, Jr." .<.rchapman@bev.net.>.)
<---------------------------------------------------------------------->
Date: Sat, 5 Oct 1996 16:49:21 -0400 (EDT)
From: kenbannister@groundwater.com (Kenneth E. Bannister)
Subject: GROUNDWATER Listserv
GROUNDWATER - An Internet Forum
Please join our global discussion group on groundwater and related topics.
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GROUNDWATER is one of the world's largest and busiest environmental listservs.
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In the body of the e-mail type the command:
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Some of the recent topics discussed on GROUNDWATER include:
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Global Perspective on Groundwater - Summary
BACTERIA AND ALUMINIUM MOBILITY
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groundwater modeling books
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Information requested Groundwater Resources in Rodonia, Brazil
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http://www.groundwater.com kenbannister@groundwater.com
Indago Felix
--------------------------------------------------------------
--------------------------------------------------------------
Kenneth E. Bannister
President - Bannister Research & Consulting
Owner - GROUNDWATER Mailing List
Charter Member - Digital Dowsers
http://www.groundwater.com kenbannister@groundwater.com
Indago Felix
--------------------------------------------------------------
<------------------------------>
Date: Sun, 06 Oct 1996 10:43:21 +0600
From: "Robert E. Chapman, Jr." .<.rchapman@bev.net.>.
Subject: UNSUBSCRIBE Robert E. Chapman, Jr.
<------------------------------>
End of Digest
************************
Contents: screen filters (robert bertollo .<.rbert@webfront.net.au.>.) July and August archives are in (rmead@cybergate.com (Richard Mead)) <---------------------------------------------------------------------->
Date: Sun, 6 Oct 1996 20:43:53 +1000 From: robert bertollo .<.rbert@webfront.net.au.>. Subject: screen filters Dear Subscribers, given that the water source is pure(clean) would someone like to comment on how the degree of filtration effects the head loss through a screen filter? how does this effect the flow rate? how do you determine an acceptable headloss through a screen filter? your thoughts on this would be very appreciated. Thanks Robert Bertollo Yenda AUSTRALIA <------------------------------>
Date: Mon, 7 Oct 1996 00:10:30 GMT From: rmead@cybergate.com (Richard Mead) Subject: July and August archives are in The "Readers Digest" version of Trickle-L for the July and August archives have been collected and placed on the Microirrigation Forum web site (http://www.cybergate.com/~rmead). Topics include: 1) Water Softener to reduce applied Ammonia 2) Ionization of water and vigor in grape vines 3) Drip questions for Kenya 4) Water savings through SDI ? 5) Using tensiometers and SDI in Hops 6) Emitter up or down? If you are new to Trickle-L or like viewing reruns, be sure to check out http://www.cybergate.com/~rmead/best.html Richard Mead Trickle-L and MF owner/manager <------------------------------>
End of Digest ************************
Contents:
New set up (apnesbitt@juno.com (Andrew P Nesbitt))
Veggies on Dip in Western NY ("Craig A. Storlie" .<.storlie@AESOP.RUTGERS.EDU.>.)
UNSUBSCRIBE TRICKLE-L (jeetu@hsmpk12a-55.eng.sun.com (Jeetendra Jangle))
Re: screen filters (cburt@oboe.aix.calpoly.edu (Charles M. Burt))
Unsubscribe (Alan .<.apf3@ix.netcom.com.>.)
<---------------------------------------------------------------------->
Date: Mon, 07 Oct 1996 07:46:55 EDT
From: apnesbitt@juno.com (Andrew P Nesbitt)
Subject: New set up
I am planning on implementing a trickle irrigation system. I would like
to put approx. 10 acres under dri in 1997. We plan on using the
following system:
~ Raised bed system
6" beds with a 24 - 30" top
~ Twin rows
~ Drip tape down the center of beds
~ Crops grown
Tomatoes
Cucumbers
Statice - (dried flower)
~ Small flowing stream is my water source
In the summer the stream reaches 75 degrees
Western NY location
Questions
Is this a viable use for drip irrigation?
What is the cost per acre to set up?
What is the recommended pump size?
Would a watering of 2X per week be as much less effective tha daily as I
have seen recommended?
Andrew Nesbitt
APNEsbitt@Juno.com
<------------------------------>
Date: Mon, 07 Oct 1996 11:08:13 -0400
From: "Craig A. Storlie" .<.storlie@AESOP.RUTGERS.EDU.>.
Subject: Veggies on Dip in Western NY
------ =_NextPart_000_01BBB440.24A01C40
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
Andrew:
I'll give quick answers here - be happy to talk on the phone if you =
want more specifics (609-455-3100).
Drip?: Yes, tomatoes do great in the northeast on mulched, raised beds =
(in NJ, early cucumbers are usually grown on clear mulch, second =
planting on black mulch, both on a flat bed). Yields are easily =
doubled, and the factor can go much higher. In our humid region, the =
principle benefit of mulch and raised beds is disease control and fruit =
rot reduction. Weed control and spring soil warming also play a big =
role. A simple drip fertilization program also will boosts yields =
substantially.
Irrigation Scheduling: I assume you are in a medium-textured soil (a =
loam or a silt loam) in western NY, but I know there also are pockets of =
both heavier and lighter soils in the region. Soil texture, OM content, =
and CEC are important in determining fertigation needs and irrigation =
scheduling. Got your fall soil test handy?=20
When your crops reach "full canopy" you will need to irrigate the =
equivalent of 2-3 hours per day in July and August if rain is =
insufficient and you are using a "high flow" (about 0.5 gpm/100 ft) =
tape. However, there is no need to irrigate daily. Your soil probably =
can hold "several days" worth of water in the top 18 inches. That is, =
you probably only need to irrigate every 3rd, or 4th, or 5th day. Daily =
irrigation recommendations from other location in the U.S. do not =
necessarily apply in our region. In Florida, for example, many growers =
irrigate daily and in some cases more than once daily because THEY MUST. =
This is because they are growing in very coarse textured sands which =
will not hold "one day's worth" of water in the plant root zone. Soil =
mosture sensing devices (tensiometers and/or Watermark sensors) work =
excellent in our humid region to help with scheduling. I highly =
recommend spending a couple hundred dollars and getting a bunch.
Cost?: Depending on the piping system and other components already on =
hand, the type of drip system I envision you using will cost between =
$500-1000 per acre (5' x 1.25-mil mulch runs around $200/ac and 8-mil =
drip about $150/acre for 5-6 ft row spacing). Surface water will =
probably require that you use sand-media primary filtration.
Pump Size: With a stream as a source, you will likely invest in a =
trailer mounted diesel turning a centrifugal pump. This is a very =
common setup in NJ for surface water source drip irrigation. =
Recommending a pump size is impossible w/o more info. If you were never =
going to expand, pump size would be based on zone size (and thus, =
required zone flow rate) and hydrualic considerations. A 0.5 gpm/100 ft =
tape on 5-ft spaced beds will require about 44 gpm/acre. Commit to =
buying tape and supplies from a reputable dealer and let them help you =
with the desgn. If they balk, find another dealer.
Enough for now - I still have peppers to pick! One last thing, =
Andrew. Are you putting those tomatoes on stakes? Do it and watch your =
size and quality double again. But maybe you should save that one for =
1998. Good luck.
Craig Storlie
Extension Specialist in Agricultural Engineering
Rutgers University
----------
From: Andrew P Nesbitt[SMTP:apnesbitt@juno.com]
Sent: Monday, October 07, 1996 7:37 AM
To: Multiple recipients of list
Subject: New set up
I am planning on implementing a trickle irrigation system. I would like
to put approx. 10 acres under dri in 1997. We plan on using the
following system:
7
~ Raised bed system
6" beds with a 24 - 30" top
~ Twin rows
~ Drip tape down the center of beds
~ Crops grown
Tomatoes
Cucumbers
Statice - (dried flower)
~ Small flowing stream is my water source
In the summer the stream reaches 75 degrees
Western NY location=20
Questions
Is this a viable use for drip irrigation?
What is the cost per acre to set up?
What is the recommended pump size?
Would a watering of 2X per week be as much less effective tha daily as I
have seen recommended?
Andrew Nesbitt
APNEsbitt@Juno.com
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------ =_NextPart_000_01BBB440.24A01C40--
<------------------------------>
Date: Mon, 7 Oct 1996 09:01:20 -0700
From: jeetu@hsmpk12a-55.eng.sun.com (Jeetendra Jangle)
Subject: UNSUBSCRIBE TRICKLE-L
UNSUBSCRIBE jeetendra.jangle@Eng
<------------------------------>
Date: Mon, 7 Oct 1996 12:46:56 -0700
From: cburt@oboe.aix.calpoly.edu (Charles M. Burt)
Subject: Re: screen filters
>Dear Subscribers,
>given that the water source is pure(clean)
>would someone like to comment on how the degree of filtration effects the
>head loss through a screen filter? how does this effect the flow rate? how
>do you determine an acceptable headloss through a screen filter?
>
>your thoughts on this would be very appreciated.
>
>Thanks
>
>Robert Bertollo
>Yenda
>AUSTRALIA
A clean screen filter should probably not have more than about 1-2 psi loss
across it. That means that a fine mesh screen may need to be larger (sq.
meters of filtration area) than a coarse mesh screen. Of course, the
problem occurs when it gets dirty - that's what the pump needs to be sized
for. The good manufacturers can provide graphs of flow rate vs. pressure
drop, for various meshes and models of screens (when clean).
There are a lot of different ideas about screen losses. I think most of us
veterans think that screens should only be used in situations in which they
won't get dirty - that is, they are typically very difficult to clean out,
and should only be used for backup devices or in EXTREMELY clean
conditions. Exceptions do exist such as the Thompson screen design which
is exclusively for sand and is oversized.
Charles M. Burt, P.E., Ph.D.
Professor and Director
Irrigation Training and Research Center (ITRC)
BioResource and Agricultural Engineering Dept.
California Polytechnic State University (Cal Poly)
San Luis Obispo, CA 93407
ph: 805-756-2379
FAX: 805-756-2433
e-mail: cburt@oboe.calpoly.edu
<------------------------------>
Date: Mon, 7 Oct 1996 14:28:08 -0700
From: Alan .<.apf3@ix.netcom.com.>.
Subject: Unsubscribe
unsubscribe apf3@ix.netcom.com
Alan Fisher
Bay City Flower Co.
(415) 712-5857
E-Mail: APF3@ix.netcom.com
<------------------------------>
End of Digest
************************
Contents:
Re: screen filters (Steve Jordan .<.sjordan@seldon.terminus.com.>.)
drip management (henri@ilink.nis.za)
Re: screen filters (Wally Menke .<.wallym@ozemail.com.au.>.)
Unsubscribe (Dan Scaliter .<.dan_scaliter@eee.org.>.)
Re: drip management (Jed Waddell .<.wadde002@maroon.tc.umn.edu.>.)
Re: drip management (Irrometer@aol.com)
Re: screen filters (ges@owt.com (Marty Grogan))
Re: screen filter headache (robert bertollo .<.rbert@webfront.net.au.>.)
RE: drip management ("Craig A. Storlie" .<.storlie@AESOP.RUTGERS.EDU.>.)
unsubscrbe (Doug Burch .<."doug@clandjop.com"@clandjop.com.>.)
unsubscribe (94043415@zaphod.riv.csu.edu.au)
<---------------------------------------------------------------------->
Date: Mon, 07 Oct 1996 13:39:00 -0700
From: Steve Jordan .<.sjordan@seldon.terminus.com.>.
Subject: Re: screen filters
>>given that the water source is pure(clean)
>>would someone like to comment on how the degree of filtration effects the
>>head loss through a screen filter? how does this effect the flow rate? how
>>do you determine an acceptable headloss through a screen filter?
>A clean screen filter should probably not have more than about 1-2 psi loss
>across it. That means that a fine mesh screen may need to be larger (sq.
>meters of filtration area) than a coarse mesh screen. Of course, the
>problem occurs when it gets dirty - that's what the pump needs to be sized
>for. The good manufacturers can provide graphs of flow rate vs. pressure
>drop, for various meshes and models of screens (when clean).
>
>There are a lot of different ideas about screen losses. I think most of us
>veterans think that screens should only be used in situations in which they
>won't get dirty - that is, they are typically very difficult to clean out,
>and should only be used for backup devices or in EXTREMELY clean
>conditions. Exceptions do exist such as the Thompson screen design which
>is exclusively for sand and is oversized.
>
>
Several growers are using the Amiad screen filter. It has a way to
automatically clean or easily manually clean. It is more compact than the
sand media. I never really considered them because they were priced the
same as sand media and (amateur opinion coming) inferior.
Inferior? I have been told that the sand medias have several faults, but
supply the greatest filter area and do the best on organics.
In the automated system, there are screens sold as backup to catastrophic
media failure. I have considered that (and pressure sustaining), but have
not added them to our installations.
Steve Jordan- Artichoke Evangelist, Wetland manager
<------------------------------>
Date: Tue, 8 Oct 1996 10:57:26 GMT
From: henri@ilink.nis.za
Subject: drip management
Hi All,
Has anyone Practical experience (successful or otherwise) of, or ideas on,
the best Economical means of Managing and Monitorinng the daily
two-dimensional flux of water under drippers in a sandy (orchard) soil?
Aim : Water saving through optimum uptake and minimum losses.
<------------------------------>
Date: Tue, 8 Oct 1996 21:52:20 +1000 (EST)
From: Wally Menke .<.wallym@ozemail.com.au.>.
Subject: Re: screen filters
At 05:37 AM 6/10/96 -0500, you wrote:
>Dear Subscribers,
>given that the water source is pure(clean)
>would someone like to comment on how the degree of filtration effects the
>head loss through a screen filter? how does this effect the flow rate? how
>do you determine an acceptable headloss through a screen filter?
>your thoughts on this would be very appreciated.
>
>Thanks
>
>Robert Bertollo
>Yenda
>AUSTRALIA
Dear Robert
Your above question has a simple answer. Generally the degree of filtration
of a screen filter has a small effect on the head loss across a CLEAN screen
filter. If you look at various mesh manufacturers literature (and this may
vary) you will find that from 40 - 200 mesh (400-80 micron) the actual open
surface area of the mesh varies very little from say 31-34 % depending on
the weave configuration. What happens is that as the aperture size decreases
so does the wire size used to make the mesh. As you have more apertures with
a finer mesh then the resistance will increase a bit. Generally the most
head loss through a filter is caused by the changes in direction that the
water goes through in the filter body itself, and not the actual clean screen.
What does vary naturally is the amount of dirt you'll collect on the screen,
and this will depend on the water source. For example, I have had experience
from Murray River water where at 200 mesh (80 micron) an automatic FILTOMAT
filter will be flushing every 3 minutes, the same filter after changing the
screen to 150 mesh (100 micron) flushes every 30 minutes!.
So it depends a lot on what your application is, if its for drip (150 mesh)
go for a filter with a larger screen surface area than you would if you were
using undertree sprinklers (80 mesh) as the level of filtration will be
finer and the cleaning of the filter more frequent. BEWARE though when
comparing different manufactureres of filters as (unfortunately) there is no
set standard for measuring the area on a screen filter. Some manufacturers
use the term
"Filter Area", which is actually the area of the total screen cylinder
including all the support structure and sealing rings, and has no real
relavence to the filter performance. In our case we use the term "Screen
Area", which is the actual effective mesh area available on the screen for
filtration.
The acceptable design head loss for a screen filter with a clean screen that
I work to with our FILTOMAT range of filters is 3 psi or 20 kPa. Head loss
charts are available from us for our filters, in our case they are
conservative, other manufacturers no doubt have their own. If your talking
automatic filters the head loss before backwashing will be an extra 5-6 psi
(adjustable) on top of this. I have customers that exceed this but the
higher the head loss the greater the energy/power loss, short term gain =
long term pain $.
Note that we have many of our filters in your area working for many years.
If you need any specific advice or literature contact me direct.
Wally Menke, Triangle Filtration, Melbourne, Australia.
Ph 03 9580 2122, Fax 03 9580 3131
<------------------------------>
Date: Tue, 08 Oct 1996 07:36:58 +0000
From: Dan Scaliter .<.dan_scaliter@eee.org.>.
Subject: Unsubscribe
unsubscribe dan_scaliter@eee.org
<------------------------------>
Date: Tue, 8 Oct 96 12:45:11 -0500
From: Jed Waddell .<.wadde002@maroon.tc.umn.edu.>.
Subject: Re: drip management
At 03:45 AM 10/8/96 -0500, you wrote:
>Hi All,
>Has anyone Practical experience (successful or otherwise) of, or ideas on,
>the best Economical means of Managing and Monitorinng the daily
>two-dimensional flux of water under drippers in a sandy (orchard) soil?
>Aim : Water saving through optimum uptake and minimum losses.
>
For the past two years I have been measuring the matric potential at two
depths (50 and 100 cm) under potato in the central sands of Minnesota.
Because of the hills created in potato production I placed tensiometers
directly under the hill and the furrow positions. With the matric potential
I can find the hydraulic gradient and multiply by the hydraulic conductivity
to get the flux. I determined the hydraulic conductivity from the average
matric potential.
As far as economics, tensiometers are cheap compared to the pressure
transducers and a data logger. Pressure transducers range in price but I
used Soil Moisture's version which cost about $250 for one. In my opinion
these are the best transducers because one calibration can be used for
years. Other cheaper transducers require annual or monthly calibrations.
My collegue used TDR to measure water distribution in a fine grid under the
potato hill. This method has high initial cost but is relatively cost free
after purchased.
We also used neutron probe tubes placed in the hill. These have a sphere of
influence about 20 cm or so. Once tubes are in place you can read them as
often as you want but is not practical for hourly measurements. We used
them for weekly measurements. Because of the radiation saftey procedures,
neutron probes are a hassle but you could probably find one fairly cheap.
Ours are old and have been around for years I don't know how much they cost.
Hope this information helps,
Jed
****************************************************
* Jed T. Waddell *
* Graduate Research Assistant *
* University of Minnesota *
* Department of Soil, Water, and Climate *
* St. Paul, MN 55108 *
* office (612) 625-1968 *
* fax (612) 625-2208 *
****************************************************
<------------------------------>
Date: Tue, 8 Oct 1996 14:28:07 -0400
From: Irrometer@aol.com
Subject: Re: drip management
In a message dated 96-10-08 05:05:02 EDT, you write:
>Hi All,
>Has anyone Practical experience (successful or otherwise) of, or ideas on,
>the best Economical means of Managing and Monitorinng the daily
>two-dimensional flux of water under drippers in a sandy (orchard) soil?
>Aim : Water saving through optimum uptake and minimum losses.
>
>
Try monitoring the soil moisture status with tensiometers appropriately
placed in the active root system and the area typically encompassed by
the suggested wetted "onion" for the specific crop root system.
Regards, Bill Pogue
<------------------------------>
Date: Tue, 8 Oct 1996 11:45:40 -0700
From: ges@owt.com (Marty Grogan)
Subject: Re: screen filters
>Dear Subscribers,
>given that the water source is pure(clean)
>would someone like to comment on how the degree of filtration effects the
>head loss through a screen filter? how does this effect the flow rate? how
>do you determine an acceptable headloss through a screen filter?
>
>your thoughts on this would be very appreciated.
>
>Thanks
>
>Robert Bertollo
>Yenda
>AUSTRALIA
>
>
Head loss can be approximated for slow flow rates using the specifications
provided by filter manufacturers. One form of calculation would be:
delP = Cv * Q delP - Head loss, Cv - filter coef., Q - flow rate
The units must be consistent to obtain useful results.
The amount of loss acceptable depends on overall system requirements--1% is
probably OK. 10% would be much too much. Other factors, i.e., the mechanical
construction of the filter and blockage ratios, also become important. More
loss
means bigger pumps and pipes, e.g., more expensive, to deliver the same
amount of water.
<------------------------------>
Date: Wed, 9 Oct 1996 06:23:28 +1000
From: robert bertollo .<.rbert@webfront.net.au.>.
Subject: Re: screen filter headache
At 11:55 PM 10/7/96 -0500, you wrote:
>>>given that the water source is pure(clean)
>>>would someone like to comment on how the degree of filtration effects the
>>>head loss through a screen filter? how does this effect the flow rate? how
>>>do you determine an acceptable headloss through a screen filter?
>
>>A clean screen filter should probably not have more than about 1-2 psi loss
>>across it. That means that a fine mesh screen may need to be larger (sq.
>>meters of filtration area) than a coarse mesh screen. Of course, the
>>problem occurs when it gets dirty - that's what the pump needs to be sized
>>for. The good manufacturers can provide graphs of flow rate vs. pressure
>>drop, for various meshes and models of screens (when clean).
>>
>>There are a lot of different ideas about screen losses. I think most of us
>>veterans think that screens should only be used in situations in which they
>>won't get dirty - that is, they are typically very difficult to clean out,
>>and should only be used for backup devices or in EXTREMELY clean
>>conditions. Exceptions do exist such as the Thompson screen design which
>>is exclusively for sand and is oversized.
>>
>>
>
>Several growers are using the Amiad screen filter. It has a way to
>automatically clean or easily manually clean. It is more compact than the
>sand media. I never really considered them because they were priced the
>same as sand media and (amateur opinion coming) inferior.
>
>Inferior? I have been told that the sand medias have several faults, but
>supply the greatest filter area and do the best on organics.
>
>In the automated system, there are screens sold as backup to catastrophic
>media failure. I have considered that (and pressure sustaining), but have
>not added them to our installations.
>Steve Jordan- Artichoke Evangelist, Wetland manager
>
>
>
Thanyou Charles,Steve & Wally for your thoughts on screen filters
What type of back up filter should be used when the main filter is a screen
filter (Automatic cleanning Amiad etc) , Would a different type of back up
filter be suggetsted? Do you think it is bad practice to have both main and
backup as screen filters? I have a 100micron (155 mesh) screen in the main
filter(self cleanning) but I am not sure what degree of filtration would be
suitable as backup(manual cleanning)?
Given clean water.My main screen filter has 6.5-7 psi head loss through the
filter when demanding 340cuM/hr (1530 USgpm), my screen size is 6000sq.cm
(930sq.in). But when I halve the flow rate the head loss is only 2 psi.
by doubling my screen size would it halve my head loss.I have always had
concerns with this high head loss , the filter appears undersized for the
higher flow rate, is this correct? Wally , I checked the spec's and the
Manufacturer does say "filter area"?!
Thankyou
Robert Bertollo
YENDA
Australia
<------------------------------>
Date: Tue, 08 Oct 1996 10:25:43 -0400
From: "Craig A. Storlie" .<.storlie@AESOP.RUTGERS.EDU.>.
Subject: RE: drip management
------ =_NextPart_000_01BBB53A.23933080
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
"henri":
Are you managing water or doing research (or both)? I buried =
Watermarks in a 2-D plane under a tape in a sandy loam and recorded =
"fluxes" with a Cambell datalogger - worked quite well. I wrote an ASAE =
paper if you are interested.
Craig Storlie
Extension Specialist in Agricultural Engineering
Rutgers University
----------
From: henri@ilink.nis.za[SMTP:henri@ilink.nis.za]
Sent: Tuesday, October 08, 1996 4:50 AM
To: Multiple recipients of list
Subject: drip management
Hi All,
Has anyone Practical experience (successful or otherwise) of, or ideas =
on,
the best Economical means of Managing and Monitorinng the daily
two-dimensional flux of water under drippers in a sandy (orchard) soil?
Aim : Water saving through optimum uptake and minimum losses.
------ =_NextPart_000_01BBB53A.23933080
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------ =_NextPart_000_01BBB53A.23933080--
<------------------------------>
Date: Tue, 08 Oct 1996 20:43:50 -0700
From: Doug Burch .<."doug@clandjop.com"@clandjop.com.>.
Subject: unsubscrbe
unsubscribe doug@clandjop.com
<------------------------------>
Date: Wed, 9 Oct 1996 11:24:46 GMT-1000
From: 94043415@zaphod.riv.csu.edu.au
Subject: unsubscribe
unsubscribe 94043415@zaphod.riv.csu.edu.au
<------------------------------>
End of Digest
************************
Contents:
Re: screen filter headache (Donbened@aol.com)
Media vs. screen??? ("Craig A. Storlie" .<.storlie@AESOP.RUTGERS.EDU.>.)
(tww1@cornell.edu (Thomas W. Walters))
drip management replies (henri@ilink.nis.za)
Screen filters (cburt@oboe.aix.calpoly.edu (Charles M. Burt))
Asparagus (Robert Carian .<.grapegrower@earthlink.net.>.)
Re: unsubscribe (biotech@rain.org)
Managing and Monitoring Flux of Water (Irrometer@aol.com)
Re: Asparagus (Jerome Pier .<.jpier@mindspring.com.>.)
Re: Asparagus (GroAire@aol.com)
Re: screen filter headache (Wally Menke .<.wallym@ozemail.com.au.>.)
Unsubscribe (94043415@zaphod.riv.csu.edu.au)
<---------------------------------------------------------------------->
Date: Wed, 9 Oct 1996 02:18:52 -0400
From: Donbened@aol.com
Subject: Re: screen filter headache
Dear Robert,
Given that you have indicated 930 sq. in. of filter area, I assume that you
are using the Amiad SAF filter.
In my experience in filtering canal and reservoir water with the SAF, the
maximum flow that you should work with on a 130 micron screen is about 900
gpm. I derive this number from the various applications that we have
specified in central California using district canal water. You are correct
in concluding that the SAF is undersized for 1500 gpm.
I recommend using the EBS filter with a filter area of 1550 sq. in. We can
accomodate canal water with flows of up to 1900 gpm. using this filter.
You can obtain head loss information and other specifications from Amiad
Australia.
If you would like some references as to the efficacy of the Amiad line of
automatic filters, I would be happy to send you a list on personal E-mail.
In response, to the generalization that screen filters should be used only
for EXTREMELY clean water -- I can only say that Amiad would not be in
business if we were not able to offer primary filtration for ALL levels of
water quality.
Don Benedict
Amiad U.S.A.
<------------------------------>
Date: Wed, 09 Oct 1996 11:26:19 -0400
From: "Craig A. Storlie" .<.storlie@AESOP.RUTGERS.EDU.>.
Subject: Media vs. screen???
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All:
I don't recall our group holding a discussion along this line before so =
I will pose a question: Can the self cleaning screen filters (SCSF) =
function under conditions of high organic matter (algae, aquatic "weeds" =
and animals) as well as media filters? =20
My limited experience with SCSF's suggests that they may fail under =
adverse conditions, especially if hit with a slug of OM which can occur, =
for example, upon system start. However, my experience with SCSF's is =
VERY LIMITED. One-half of the water used for drip in NJ is surface =
water. Many stagnent ponds become very "challenging" to use as a drip =
source by mid-August. Media filtration is used to clean ~99% of the =
surface waters used for drip in NJ. =20
Please comment on SCSF vs. media in terms of cost, failure potential, =
maintenance, etc.
Thanks All,
Craig Storlie
Extension Specialist in Agricultural Engineering
Rutgers University
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<------------------------------>
Date: Wed, 9 Oct 1996 12:39:14 -0500
From: tww1@cornell.edu (Thomas W. Walters)
Subject:
unsubscribe tww1@cornell.edu
Thomas W. Walters
Cornell University
Department of Fruit and Vegetable Science
157 Plant Science Building
Ithaca, NY 14853-5908
(607)255-2493
tww1@cornell.edu
<------------------------------>
Date: Wed, 9 Oct 1996 19:40:44 GMT
From: henri@ilink.nis.za
Subject: drip management replies
My very grateful thanks to the following List members who kindly answered my
questions yesterday :
Dave Scott
Jed Waddell
Rick Allen
Craig A Storlie
Robert Phene
Tony Thomson
Jos Balendonck
Bill Pogue
Jack Hillen
The responses from Australia, South Africa the USA and The Netherlands
indicate the usefulness of the List. Thanks Richard! Must now get down to
studying the information received.
<------------------------------>
Date: Wed, 9 Oct 1996 10:47:47 -0700
From: cburt@oboe.aix.calpoly.edu (Charles M. Burt)
Subject: Screen filters
I noticed the note by Don Benedict of AMIAD, and it's obvious that I need
to clarify my comments about screens.
My comments were directly soley towards typical tubular screens, not
towards the type that AMIAD sells. I don't think of the AMIAD units under
the "screen" category, although they have a screen inside of them. One
look at the mechanism of self-cleaning, and the construction of the screens
themselves within the AMIAD unit, removes them from the standard screen
discussions.
Two big disadvantages of standard screens are eliminated with the AMIAD
design - (1) the small surface area is compensated for by automatic
self-cleaning, so the surface area does not need to hold and store large
amounts of contaminants, and (2) the flushing mechanism is unique,
localized, and effective. Most screens are difficult to clean because they
require some type of throughflush or manual removal.
Charles M. Burt, P.E., Ph.D.
Professor and Director
Irrigation Training and Research Center (ITRC)
BioResource and Agricultural Engineering Dept.
California Polytechnic State University (Cal Poly)
San Luis Obispo, CA 93407
ph: 805-756-2379
FAX: 805-756-2433
e-mail: cburt@oboe.calpoly.edu
<------------------------------>
Date: Wed, 9 Oct 96 14:11:50 -0000
From: Robert Carian .<.grapegrower@earthlink.net.>.
Subject: Asparagus
Does anyone out there have experience with growing asparagus on drip. If
so, what type of lines, emmitters, etc. are you using. I want to grow @8
acres organically in Mex.
thanks
<------------------------------>
Date: Wed, 9 Oct 1996 14:12:02 -0700 (PDT)
From: biotech@rain.org
Subject: Re: unsubscribe
unsubscribe biotech@rain.org
<------------------------------>
Date: Wed, 9 Oct 1996 17:31:18 -0400
From: Irrometer@aol.com
Subject: Managing and Monitoring Flux of Water
You may be interested in the use of the Watermark Soil
Moisture Sensor as used in a paper entitled "Placement
of Soil Moisture Sensors in Sprinkler Irrigated Potatoes",
by Tim Stieber and Clinton Shock (American Potato Journal,
1995, pp. 533-543). Shock can be reached via: mesosu@
primenet.com or you can check out the home page of
Oregon State University Malheur Experiment Station under
Granular Matrix Sensors for additional references in both
agriculture and landscape environmnets: http://www.primenet.
com/~mesosu/
Regards, Bill Pogue
<------------------------------>
Date: Wed, 09 Oct 1996 15:02:53 -0700
From: Jerome Pier .<.jpier@mindspring.com.>.
Subject: Re: Asparagus
Robert Carian wrote:
>
> Does anyone out there have experience with growing asparagus on drip. If
> so, what type of lines, emmitters, etc. are you using. I want to grow @8
> acres organically in Mex.
> thanks
Dear Robert,
There are several large growers on the west side of the San Joaquin
Valley in CA who are using Netafim Python 0.13 mil dripperline buried
10-12" on 40" beds. Steve Smith of Turlock Fruit has had very good
sucess with transplanting crowns. You will have to apply regular doses
of N-pHuric or some other acid to prevent root intrusion during the late
fall and winter when your irrigation applications will be infrequent
(assuming the use of acid is kosher with the organic certification
board; I presume that the use of Trifluralin is a no-no!). Asparagus has
an agressive, fibrous root system. If you cannot chemigate to prevent
root intrusion, then you must make sure that you irrigate even during
the off-season to maintain moisture about the emitters. I can find more
information if you are interested.
<------------------------------>
Date: Wed, 9 Oct 1996 21:03:58 -0400
From: GroAire@aol.com
Subject: Re: Asparagus
I have a client in Nebraska who has had 5 years experience growing asparagus
over buried drip with using the same system for injection of atmospheric air
into the root zone. I design and sell both types of systems. I also have 25
years of experience in designing all phases of irrigation from gated pipe to
center pivot with an emphasis in the last 10 years on buried drip for
injection of water and air. 90% of all my growers are organic growers
because of the benefits of air injection. I'm currently in the design phase
for a 1 million square foot greenhouse for growing organic tomatoes using the
technology for a group of investors from Denver, Colorado. I have plots of
rasberries in Washington, vegetables in Wisconsin, Vegetables in Colorado,
Vegetables in Nebraska, Purple coneflower in North Dakota, and Greenhouses in
Missouri, Nebraska, & Colorado. How may I be of service?
Dave Enyeart
Senior Engineer
GroAire Irrigation Inc
303-650-0472
GroAire@aol.com
<------------------------------>
Date: Thu, 10 Oct 1996 11:26:40 +1000 (EST)
From: Wally Menke .<.wallym@ozemail.com.au.>.
Subject: Re: screen filter headache
>Thanyou Charles,Steve & Wally for your thoughts on screen filters
>What type of back up filter should be used when the main filter is a screen
>filter (Automatic cleanning Amiad etc) , Would a different type of back up
>filter be suggetsted? Do you think it is bad practice to have both main and
>backup as screen filters? I have a 100micron (155 mesh) screen in the main
>filter(self cleanning) but I am not sure what degree of filtration would be
>suitable as backup(manual cleanning)?
>Given clean water.My main screen filter has 6.5-7 psi head loss through the
>filter when demanding 340cuM/hr (1530 USgpm), my screen size is 6000sq.cm
>(930sq.in). But when I halve the flow rate the head loss is only 2 psi.
>by doubling my screen size would it halve my head loss.I have always had
>concerns with this high head loss , the filter appears undersized for the
>higher flow rate, is this correct? Wally , I checked the spec's and the
>Manufacturer does say "filter area"?!
>
>
>Thankyou
>
>Robert Bertollo
>YENDA
>Australia
Dear Robert & Others
It depend on what inlet/outlet you have fitted on this filter, I assume it
would be 8", but for this flow I would suggest 10", and that this head loss
on a clean screen is too high from a design point of view, and will cost you
in power bills. I think possibly a case of a manufacturer being optimistic
about its figures?, as according to Amiad brochure for 8" SAF head loss at
340 m3/hr flow is listed at about 2.2 psi or 15 kPa. The screen or "filter
area" should be adaquate your main loss will be across the body, As a rule
of thumb if the filter is backwashing at 15 minutes + intervals its OK.
In my opinion all drip systems should be fitted with a manually cleaning
back-up filters fitted at ALL field valves, (where the sub-main starts) no
matter what filter you've got at the head of the system. (Its amazing how
many people don't follow this advice for the sake of saving a few $), you
could call it an insurance policy, something you don't need until a disaster
happens - like a burst main line, a failure in the main filters (no matter
what type or brand), or on the seasons first start-up where all sorts of
coagulated material and things that have grown in the lines come out. Media
filters should have back up filters straight after them as well in case of
internal failure, dumps the media into the system.
The mesh size should be 80-120 mesh depending on what drippers you've got,
if your using Plastro stick with 120. The type can be disc or screen again
depending on your personal preference.
Regarding the subject of screen vs media filter performance, there is now a
filter the MCFM Filtomat which can handle just about any bad water, organics
situation. We have units here running on primary settled sewage water with
250 mesh/50 micron filtration level running at 1030 usgpm, and even running
in paper mills on white water. In fact in Israel Kibuttz Naan have 3 of
these units on there own internal irrigation system that runs on treated
effluent. These replaced their previous filtration system that consisted of
14 x 36" media filters. They find then easier to run and maintain.
On Steves comment about pressure sustaining valves.
Virtually any extensive system should be fitted with one after your main
filters. This will control the flow going through your filters more evenly
on start-up. If you take a long time to build up pressure on start up the
velocity of water going through the filters can potentially cause a bit of
grief no matter what filters you've got. The other factors are that the
pumps could be screaming off their curves and cavitating, and water
hammer/surges downstream as the lines fill up with a full on flow.
Cheers
Wally Menke - Triangle Filtration - Melb, Aust.
<------------------------------>
Date: Thu, 10 Oct 1996 12:16:08 GMT-1000
From: 94043415@zaphod.riv.csu.edu.au
Subject: Unsubscribe
unsubscribe 94043415@zaphod.riv.csu.edu.au
<------------------------------>
End of Digest
************************
Contents:
Re: Asparagus(GroAire) ("David S. Ross" .<.dr27@umail.umd.edu.>.)
(BRIAN_DOTSON@ati.org (BRIAN DOTSON))
<---------------------------------------------------------------------->
Date: Thu, 10 Oct 1996 08:33:07 -0400 (EDT)
From: "David S. Ross" .<.dr27@umail.umd.edu.>.
Subject: Re: Asparagus(GroAire)
GroAire, at the risk of learning something new, I would invite you to give
an overview on what you are doing with air injection - soil conditions,
amount of air, benefits, system requirements, etc. David Ross, Maryland
At 08:01 PM 10/9/96 -0500, GroAire@aol.com wrote:
>I have a client in Nebraska who has had 5 years experience growing asparagus
>over buried drip with using the same system for injection of atmospheric air
>into the root zone. I design and sell both types of systems. I also have 25
>years of experience in designing all phases of irrigation from gated pipe to
>center pivot with an emphasis in the last 10 years on buried drip for
>injection of water and air. 90% of all my growers are organic growers
>because of the benefits of air injection. I'm currently in the design phase
>for a 1 million square foot greenhouse for growing organic tomatoes using the
>technology for a group of investors from Denver, Colorado. I have plots of
>rasberries in Washington, vegetables in Wisconsin, Vegetables in Colorado,
>Vegetables in Nebraska, Purple coneflower in North Dakota, and Greenhouses in
>Missouri, Nebraska, & Colorado. How may I be of service?
>
>Dave Enyeart
>Senior Engineer
>GroAire Irrigation Inc
>303-650-0472
>GroAire@aol.com
>
............................................................................
Dr. David S. Ross 301-405-1188 office
Extension Agricultural Engineer 301-498-2234 home
Dept. of Biological Resources Engineering 301-314-9023 office fax
University of Maryland 301-405-1198 Dept.
College Park, Maryland 20742-5711 dr27@umail.umd.edu
NOTE: new department name 3/28/96
>>>>>>>>>>>>>>>>>..........................................<<<<<<<<<<<<<<<<<
<------------------------------>
Date: Thu, 10 Oct 1996 08:41:22 -0400
From: BRIAN_DOTSON@ati.org (BRIAN DOTSON)
Subject:
unsubscribe
<------------------------------>
End of Digest
************************
Contents:
Re: TRICKLE-L digest 604 (TPiatkowsk@aol.com)
RE: drip management (Stefano Ferraris .<.ferraris@lewy.dmsa.unipd.it.>.)
Air injection ("Dirk Keeler" .<.Dirk@zianet.com.>.)
(Alan .<.apf3@ix.netcom.com.>.)
Re: Air injection(Ross) ("David S. Ross" .<.dr27@umail.umd.edu.>.)
A new member from Florida (Richard Mead .<.rmead@asrr.arsusda.gov.>.)
<---------------------------------------------------------------------->
Date: Fri, 11 Oct 1996 01:03:00 -0400
From: TPiatkowsk@aol.com
Subject: Re: TRICKLE-L digest 604
To J. D. Oster,
I am sending you the information by mail. I apologize for the delay, I was
out of town and way behind on my e-mail.
Tom
<------------------------------>
Date: Fri, 11 Oct 1996 09:23:37 +0100 (ITA)
From: Stefano Ferraris .<.ferraris@lewy.dmsa.unipd.it.>.
Subject: RE: drip management
i'm very iterested to your paper.
Stefano Ferraris
Dept. of Agricultural, Forest. and Environm. Economy and Engineering
Universita' di Torino
8, c.Raffaello Torino 10126
tel.+39.11.6692789 fax +39.11.658344 Italy:
On Tue, 8 Oct 1996, Craig A. Storlie wrote:
>
> ------ =_NextPart_000_01BBB53A.23933080
> Content-Type: text/plain; charset="us-ascii"
> Content-Transfer-Encoding: quoted-printable
>
> "henri":
>
> Are you managing water or doing research (or both)? I buried =
> Watermarks in a 2-D plane under a tape in a sandy loam and recorded =
> "fluxes" with a Cambell datalogger - worked quite well. I wrote an ASAE =
> paper if you are interested.
>
> Craig Storlie
> Extension Specialist in Agricultural Engineering
> Rutgers University
>
> ----------
> From: henri@ilink.nis.za[SMTP:henri@ilink.nis.za]
> Sent: Tuesday, October 08, 1996 4:50 AM
> To: Multiple recipients of list
> Subject: drip management
>
> Hi All,
> Has anyone Practical experience (successful or otherwise) of, or ideas =
> on,
> the best Economical means of Managing and Monitorinng the daily
> two-dimensional flux of water under drippers in a sandy (orchard) soil?
> Aim : Water saving through optimum uptake and minimum losses.
>
>
>
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> AAAAAwAREAEAAABAAAcwAN6r2iO1uwFAAAgwAN6r2iO1uwEeAD0AAQAAAAUAAABSRTogAAAAAFNh
>
>
> ------ =_NextPart_000_01BBB53A.23933080--
>
>
<------------------------------>
Date: Fri, 11 Oct 1996 08:43:28 -0600
From: "Dirk Keeler" .<.Dirk@zianet.com.>.
Subject: Air injection
To: Dr. David S. Ross
I don't know about Dave Enyeart at GroAire@aol.com, but I would be very
interested to know what you have to say about air injection in SDI.
Also Dave Enyeart,
What equipment is involved in injecting the air? "Is there a special
tape?", would be my main question.
Dirk Keeler
New Mexico Irrigation
Chile pepper capital of the World
<------------------------------>
Date: Fri, 11 Oct 1996 07:49:01 -0700
From: Alan .<.apf3@ix.netcom.com.>.
Subject:
UNSUBSCRIBE apf3@ix.netcom.com
Alan Fisher
Bay City Flower Co.
(415) 712-5857
E-Mail: APF3@ix.netcom.com
<------------------------------>
Date: Fri, 11 Oct 1996 15:08:03 -0400 (EDT)
From: "David S. Ross" .<.dr27@umail.umd.edu.>.
Subject: Re: Air injection(Ross)
I am no expert on this topic, but I was curious and figured it might be a
worthy topic of discussion. I knew that there was work being done but I do
not have personal experience in the area. David Ross
At 09:36 AM 10/11/96 -0500, Dirk Keeler wrote:
>To: Dr. David S. Ross
>
>I don't know about Dave Enyeart at GroAire@aol.com, but I would be very
>interested to know what you have to say about air injection in SDI.
>
>Also Dave Enyeart,
>What equipment is involved in injecting the air? "Is there a special
>tape?", would be my main question.
>
>Dirk Keeler
>New Mexico Irrigation
>Chile pepper capital of the World
>
>
............................................................................
Dr. David S. Ross 301-405-1188 office
Extension Agricultural Engineer 301-498-2234 home
Dept. of Biological Resources Engineering 301-314-9023 office fax
University of Maryland 301-405-1198 Dept.
College Park, Maryland 20742-5711 dr27@umail.umd.edu
NOTE: new department name 3/28/96
>>>>>>>>>>>>>>>>>..........................................<<<<<<<<<<<<<<<<<
<------------------------------>
Date: Fri, 11 Oct 1996 22:54:04 GMT
From: Richard Mead .<.rmead@asrr.arsusda.gov.>.
Subject: A new member from Florida
Enclosed is a response to my introductory questions from a new member.
Allow me to introduce, Dr. Larry Parsons from Florida.
R. Mead
Trickle-L owner/manager
-------------------------------------------------------------
>To Trickle-L
> I am Dr. Larry Parsons and am on the faculty of the University of Florida.
>I'm located at the Citrus Research and Education Center in Lake Alfred, FL.
>I do research and extension work on microsprinkler irrigation of citrus. I'm
>particularly interested in microsprinkler and drip irrigation management on
>sandy soils. We have also done a lot of work on microsprinkler irrigation
>for citrus frost protection. We do not use subsurface drip irrigation much
>because cutting citrus roots to install subsurface systems can lead to root
>sprouts. Microspinkler systems are used more commonly on the central Florida
>ridge because they provide better coverage than drip on the sandy soils and
>also provide some frost protection.
> The major problems with trickle irrigation have been plugging of the systems
>due to iron or slime organisms. Fertigation is used and works well with young
>trees. Standard liquid fertilizer, primarily N and K, are most commonly used.
>We have not yet seen a real reduction in fertilizer or water use, but are
>interested in seeing if we can demonstrate possible reductions. Water quality
>problems include salinity (primarily along the coast but some inland sites as
>well) and iron slime plugging problems. Usually chlorine or other chemicals
>are injected to deal with plugging.
> We usually irrigate 2 to 3 times per week if there is no rainfall. We have
>some recent data that suggests that daily irrigation (with rain delays) may
>promote better growth of young citrus trees than longer irrigation periods
>every 2 or 4 days. I have not heard of much rodent damage, but we do have
>other pests in some areas that plug up or chew on irrigation lines. We are
>generally satisfied with the uniformity of our systems. We had an irrigation
>engineer design them, so we assume they are OK. I heard about trickle-l from
>other faculty at the University of Florida.
>
>
<------------------------------>
End of Digest
************************
Contents: Drip Tape (ondeck@pacificrim.net) <---------------------------------------------------------------------->
Date: Fri, 11 Oct 1996 23:09:32 -0700 (PDT) From: ondeck@pacificrim.net Subject: Drip Tape Just a brief question.. We installed subsurface drip irrigation,(T-Tape made by T-Systems) about 4 years ago on 17 acres of raspberries. We are expanding and need to know what other brands are available. Locally we have T-Tape and Netafim. We are interested in finding out if there has been advance in designs or new technology. We have had good luck with T-Tape but this is an opportunity to explore a bit more before we commit. Root intrusion may be a problem in the future but no problems yet. Tena Ondeck Borderland Farms ondeck@pacificrim.net <------------------------------>
End of Digest ************************