From ab4el@ab4el.com Sat May 18 00:00 EDT 1996
From: Stephen Modena <modena@SunSITE.unc.edu>
Message-Id: <96051801.modena@sunsite.unc.edu>
Subject: TRICKLE-L LOG9605
Date: Sat, 18 May 1996 00:01:00 -0400 (EDT)
This is the compendium of TRICKLE-L digests for May 1996.
It was prepared from the daily digest mailings. Some digests
may be missing, because occasional mailings are lost en route.
From root@crcnis1.unl.edu Wed May 1 00:45 EDT 1996
Date: Tue, 30 Apr 1996 23:36:53 -0500
Message-Id: <199605010436.AA16764@crcnis1.unl.edu>
Errors-To: rmead@asrr.arsusda.gov
Reply-To: <trickle-l@unl.edu>
To: Multiple recipients of list <trickle-l@unl.edu>
Subject: TRICKLE-L digest 486
Contents:
Re: SDI herbicide impregnated emitters (EnnisEng@aol.com)
Date: Tue, 30 Apr 1996 12:23:46 -0400
From: EnnisEng@aol.com
Subject: Re: SDI herbicide impregnated emitters
Contact Rodney Ruskin at Geoflow at 800-828-3388 or 425-331-0166. Hope this
helps.
Tom Ennis
Ennis Engineering
End of Digest
************************
From root@crcnis1.unl.edu Thu May 2 00:45 EDT 1996
Date: Wed, 1 May 1996 23:37:26 -0500
Message-Id: <199605020437.AA10124@crcnis1.unl.edu>
Errors-To: rmead@asrr.arsusda.gov
Reply-To: <trickle-l@unl.edu>
To: Multiple recipients of list <trickle-l@unl.edu>
Subject: TRICKLE-L digest 487
Contents:
irrigation frequency (Jochen.Eberhard@t-online.de (Jochen Eberhard))
Date: Wed, 1 May 96 12:09 +0100
From: Jochen.Eberhard@t-online.de (Jochen Eberhard)
Subject: irrigation frequency
A question to Abelardo Contreras and everybody involved in the subject:
Welcome to the group and thanks for the introduction.
You wrote:
> 8) How frequent do you irrigate? Many times a day or just one long session
per day or several days? <
>Very frequently daily more than 8 times daily.
I would be glad if you could describe your irrigation system a little bit.
How long is one irrigation cycle. It can not be very long?? Is there a minimum
irrigation time when using drip irrigation systems, because it usually takes
some time to fill the system with water. So I thinks the longer the irrigation
cycle is, the better is the distribution uniformity. In other words: one long
irrigation event per day is better than 3 short ones, taking normal soil
conditions.
Is this right and are there any reports about minimum irrigation time depending
on length of the systems, and what about if there is a slope in the field. Is it
better in this case to feed the lines from the higher elevation?
If the group had already discussed this problems in former times, please tell me
the time and I will get the files.
Thanks
Jochen Eberhard
email: Jochen.Eberhard@t-online.de
End of Digest
************************
From root@crcnis1.unl.edu Fri May 3 12:53 EDT 1996
Date: Fri, 3 May 1996 11:44:16 -0500
Message-Id: <199605031644.AA15553@crcnis1.unl.edu>
Errors-To: rmead@asrr.arsusda.gov
Reply-To: <trickle-l@unl.edu>
To: Multiple recipients of list <trickle-l@unl.edu>
Subject: TRICKLE-L digest 488
Contents:
RE: rodents, tobacco, cleaning products. (Manrique Brenes <mjbrenes@ucdavis.edu>)
Date: Fri, 3 May 1996 09:38:04 -0700
From: Manrique Brenes <mjbrenes@ucdavis.edu>
Subject: RE: rodents, tobacco, cleaning products.
A friend in Brazil has forwarded me the following questions, I could use =
all the feedback and comments to see if I can give him some answers:
1-Some distributors there are claiming that some kinds of tapes are more =
susceptible than others, to rodents attack. I had never heard anything =
like that, still if for any reason this would be true please let me know =
the rational behind it. I remember there was a long discussion on =
rodents and how to address them not long ago. If anyone could remind the =
approximate dates I could go back to the stored files to rechecked them?
2-I know that some companies are selling cleaning solutions for drip =
systems (Dissolve?). I remember they were somewhat popular when Bi-wall =
was still around. Does anyone has any expirience with these products =
and know where to contact these manufacturers.
3-Does anyone out there has any experience with drip management in =
tobacco. I know from an experience in Costa Rica 5 years ago that the =
impact was good, but at that time we could not justify it economically. =
Other people has mentioned to me that they have had problems bringing =
the leaves to a maturity. Any feedback is appreciated.
Thanks a lot.
Manrique Brenes
UC Davis=20
End of Digest
************************
From root@crcnis1.unl.edu Sat May 4 12:52 EDT 1996
Date: Sat, 4 May 1996 11:44:32 -0500
Message-Id: <199605041644.AA06687@crcnis1.unl.edu>
Errors-To: rmead@asrr.arsusda.gov
Reply-To: <trickle-l@unl.edu>
To: Multiple recipients of list <trickle-l@unl.edu>
Subject: TRICKLE-L digest 489
Contents:
GROUNDWATER Listserv (KenBannister@groundwater.com (Kenneth E. Bannister))
RE: rodents, tobacco, reply from F. Lamm (FLamm@oznet.ksu.edu (Freddie Lamm))
Date: Fri, 3 May 1996 14:36:24 -0400 (EDT)
From: KenBannister@groundwater.com (Kenneth E. Bannister)
Subject: GROUNDWATER Listserv
ANNOUNCING: GROUNDWATER and GROUNDWATER-DIGEST
New Internet Mailing Lists
Please join our global discussion group on groundwater and related topics.
There are over 1100 members worldwide, with many USGS, EPA and Corps of
Engineers members. If you have a groundwater question, we can help.
.........................................................................
GROUNDWATER
To subscribe to GROUNDWATER send e-mail to:
majordomo@ias.champlain.edu
In the body of the e-mail type the command:
subscribe GROUNDWATER
.....................................................................
SOME RECENT TOPICS COVERED IN GROUNDWATER
...................................................................
groundwater-digest Friday, 26 April 1996 Volume 01 : Number 073
variable DO values
Re: Documented impacts of feedlots and dairies on ground water
volatile contaminant extraction
Re: REFERENCES FOR SURFACE AND SUBSURFACE MODELS
UN-GWW
FW: NGWA Computer Workshop
RE: UN-GWW - Attention: Maina-Gichaba
CREAMS and GLEAMS
water ages
groundwater-digest Monday, 22 April 1996 Volume 01 : Number 071
Where to drill groundwater well
Re: Logon's approximation
Re: contaminant retardation factors
Re: Where? EPA reports?
groudnwater cost estimating
Large groundwater data mgmt deal
Re: Richard's equation
Paradioxane remediation
Distance Learning Courses in Subsurface Hydrology
REFERENCES FOR SURFACE AND SUBSURFACE MODELS
Re: WHAT ARE MICROVAL/g?
RETC Code etc.
groundwater-digest Wednesday, 17 April 1996 Volume 01 : Number 068
TROXLER Sentry 200-AP
Dissolved Air Flotation
Automation of groundwater readings
MODELING SHORT COURSE ANNOUNCEMENT
Deuterated-BTEX Tracers
Re: Oxidative coupling?
Data Management Software
Re: water ages
Re: Surface seals of wells and pollution
Deuterated organics correction
##########################################################################
GROUNDWATER-DIGEST
For those of you concerned with the high traffic on this list, the list is
digested,you will get about one mail per day with all posts and the headers
cut out. It is packed up by size. When the list gets over 40,000 characters
it puts all the messages
together, ships it off to any subscribers, and puts it in the
archive directory.
You can see that we have several archives(over 70) so far by sending the
following in
the body of a message: index groundwater
to: listserv@ias.champlain.edu
(or index groundwater-digest. They are the same for archiving)
Then by sending 'get groundwater v01.n001' (no quotes) to the
listserv you will get the first archive.
To subscribe to GROUNDWATER-DIGEST send e-mail to:
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*************************************************************
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Kenneth E. Bannister
President - BANNISTER RESEARCH & CONSULTING
Owner - GROUNDWATER-DIGEST Mailing List
http://www.sover.net/~dowser/ KenBannister@groundwater.com
Companies don't create leaders,customers do.(Ries & Trout 1986)
--------------------------------------------------------------
Date: 03 May 96 16:14:53 CDT
From: FLamm@oznet.ksu.edu (Freddie Lamm)
Subject: RE: rodents, tobacco, reply from F. Lamm
LAMM COMMENTS IN CAPITAL LETTERS
> 1-Some distributors there are claiming that some kinds of tapes are more =
> susceptible than others, to rodents attack. I had never heard anything =
> like that, still if for any reason this would be true please let me know =
> the rational behind it. I remember there was a long discussion on =
> rodents and how to address them not long ago. If anyone could remind the =
> approximate dates I could go back to the stored files to rechecked them?
>
THIS WAS ON TRICKLE-L DURING LAST 2 WEEKS OF FEBRUARY.
I BELIEVE RICHARD MEAD HAS SUMMARIZED THIS ON HIS WEBSITE?
RICHARD, IS THS CORRECT???
> 3-Does anyone out there has any experience with drip management in =
> tobacco. I know from an experience in Costa Rica 5 years ago that the =
> impact was good, but at that time we could not justify it economically. =
> Other people has mentioned to me that they have had problems bringing =
> the leaves to a maturity. Any feedback is appreciated.
ILAN BAR FROM NETAFIM GAVE PAPER AT 5TH INTERNATIONAL MICROIRRIGATION CONGRESS,
APRIL 2-6, 1995, ORLANDO FLORIDA, PAGES 645-650 IN PROCEEDINGS
AVAILABLE FROM ASAE.
FREDDIE LAMM
*.
Freddie Lamm *
Research Agricultural Engineer *** o
KSU Northwest Research-Extension Center ***** /|\
105 Experiment Farm Road *******\\
Colby, Kansas 67701-1697 *********
Ph. 913-462-6281 ***********
FAX 913-462-2315 *************
Email:flamm@oznet.ksu.edu It's all downhill from here.
------ THERE'S NO DOMAIN LIKE OZ, THERE'S NO DOMAIN LIKE OZ. ------
End of Digest
************************
From root@crcnis1.unl.edu Sun May 5 12:54 EDT 1996
Date: Sun, 5 May 1996 11:45:15 -0500
Message-Id: <199605051645.AA20473@crcnis1.unl.edu>
Errors-To: rmead@asrr.arsusda.gov
Reply-To: <trickle-l@unl.edu>
To: Multiple recipients of list <trickle-l@unl.edu>
Subject: TRICKLE-L digest 490
Contents:
gopher info archives (rmead@CyberGate.COM (Richard Mead))
Date: Sun, 5 May 1996 14:54:30 GMT
From: rmead@CyberGate.COM (Richard Mead)
Subject: gopher info archives
Regarding the recent posting:
1-Some distributors there are claiming that some kinds of tapes are more =
>> susceptible than others, to rodents attack. I had never heard anything =
>> like that, still if for any reason this would be true please let me know =
>> the rational behind it. I remember there was a long discussion on =
>> rodents and how to address them not long ago. If anyone could remind the =
>> approximate dates I could go back to the stored files to rechecked them?
>>
>
>THIS WAS ON TRICKLE-L DURING LAST 2 WEEKS OF FEBRUARY.
>I BELIEVE RICHARD MEAD HAS SUMMARIZED THIS ON HIS WEBSITE?
>RICHARD, IS THS CORRECT???
>
Yes, the specific web site address is http://www.cybergate.com/~rmead/goph.html
If you do not have web access, let me know and I'll cut and paste this
information
and send it to you via email.
Thanks for your interest!
Richard Mead
Trickle-L and MIF owner/manager
http://www.cybergate.com/~rmead
End of Digest
************************
From root@crcnis1.unl.edu Mon May 6 12:55 EDT 1996
Date: Mon, 6 May 1996 11:46:16 -0500
Message-Id: <199605061646.AA15575@crcnis1.unl.edu>
Errors-To: rmead@asrr.arsusda.gov
Reply-To: <trickle-l@unl.edu>
To: Multiple recipients of list <trickle-l@unl.edu>
Subject: TRICKLE-L digest 491
Contents:
Fe clogging (henri@ilink.nis.za)
Fwd: IWM Training material (MSorren175@aol.com)
Date: Sun, 5 May 1996 22:45:29 GMT
From: henri@ilink.nis.za
Subject: Fe clogging
What is the most appropriate method of reducing clogging of
drippers by iron rich ( 3.5m/l ) borehole irrigation water?
Jean Piaget/
Date: Sun, 5 May 1996 18:37:18 -0400
From: MSorren175@aol.com
Subject: Fwd: IWM Training material
---------------------
Forwarded message:
Subj: IWM Training material
Date: 96-05-05 18:28:52 EDT
From: MSorren175
To: IRRIGATION-L@vm.gmd.de
I 'm working with a team of NRCS water management engineers and specialists
to design and develop National Irrigation training for NRCS employees. We
are developing training materials for the following irrigation
catagories:Soil-water-plant relationships; Irrigation system planning;
Irrigation system design; Water measurement; Irrigation scheduling; Soil
moisture measurement; IWM Plan; and Irrigation system evaluation.
We plan to use lesson plans with videos and slide presentations. I'm looking
for prepared training material within these categories, especially up to
date videos and visual aids. Please let me know what may be available,
including ordering information and associated costs.
Anything on chemigation/fertigation; trickle design and evaluation; and
irrigation scheduling would be very helpful, as we are lacking in these
catagories.
Thank you VERY MUCH!!
PS.. If there are videos that we could view, our group is meeting in Fort
Worth, TX May 13-17. Please send to: USDA,NRCS, Don Holley, Employee
Development Specialist, NECD, 501 Felix St., PO Box 6567, Fort Worth, TX,
76115-0567 .
E-mail: dholley@ftw.nrcs.usda.gov
End of Digest
************************
From root@crcnis1.unl.edu Tue May 7 13:04 EDT 1996
Date: Tue, 7 May 1996 11:50:12 -0500
Message-Id: <199605071650.AA28901@crcnis1.unl.edu>
Errors-To: rmead@asrr.arsusda.gov
Reply-To: <trickle-l@unl.edu>
To: Multiple recipients of list <trickle-l@unl.edu>
Subject: TRICKLE-L digest 492
Contents:
Re: Fe clogging (sjordan@seldon.terminus.com (Steve Jordan))
SoWaCS list goes Majordomo ("Bruce Metelerkamp" <BRUCE@mailgate.icfrnet.unp.ac.za>)
Date: Mon, 6 May 1996 22:43:04 -0700
From: sjordan@seldon.terminus.com (Steve Jordan)
Subject: Re: Fe clogging
>What is the most appropriate method of reducing clogging of
>drippers by iron rich ( 3.5m/l ) borehole irrigation water?
>Jean Piaget/
The book says either
oxidate by storage (reservior) for 12 to 24 hours
chlorinate to oxidate and filter residue
acidize to 4.0
OR use polymer (polymoleirc acid or phosphonate)
Which is best? Depends....
Steve Jordan @ Second Foundation
Date: Tue, 7 May 1996 13:50:53 +200
From: "Bruce Metelerkamp" <BRUCE@mailgate.icfrnet.unp.ac.za>
Subject: SoWaCS list goes Majordomo
Announcement : Email Discussion Group : SoWaCS
The recently formed Soil Water Content Sensor email discussion
group (SoWaCS) has just been automated with the help of the
Majordomo listserver. (May 1996)
The list covers discussion and news on all manner of soil water
content (and suction) sensing technology. From TDR to
tensiometers and all points in between - hopefully!
Other 'water potential-related technologies' are bound to be
covered sooner or later. Neutron probes are another soon-to-be
discussed candidate.
To subscribe send
subscribe sowacs
in the body of a message to
majordomo@aqua.ccwr.ac.za
Background to the list and an archive of the important posts,
especially summaries, will be maintained at the SoWaCS homepage,
(where links to related sites are also to be found):
http://www.icfrnet.unp.ac.za/~metele/SoWaCS.html
Current membership is below 100 and so less than one message per
day can be expected. However, this implies quality over
quantity...
Please join if you feel you can interact.
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.
Bruce Metelerkamp SOIL WATER RESEARCH OFFICER
Institute for Commercial Forestry Research,
University of Natal, PO Box 100281
Scottsville, ZA3209
Rep. of South Africa Voice:27 331 62314
E-mail: bruce@icfr.unp.ac.za FAX:27 331 68905
URL http://www.icfrnet.unp.ac.za/~metele
/SoWaCS.html
/RR.html
Host of SoWaCS (Soil Water Content Sensor) Discussion List.
End of Digest
************************
From root@crcnis1.unl.edu Wed May 8 13:16 EDT 1996
Date: Wed, 8 May 1996 11:59:49 -0500
Message-Id: <199605081659.AA10737@crcnis1.unl.edu>
Errors-To: rmead@asrr.arsusda.gov
Reply-To: <trickle-l@unl.edu>
To: Multiple recipients of list <trickle-l@unl.edu>
Subject: TRICKLE-L digest 493
Contents:
irrigation frequency (YOSSI INGBER <100320.3653@CompuServe.COM>)
Re: SDI herbicide impregnated emitters (txgator@ct.net (Jim Brigham))
Date: 08 May 96 00:07:58 EDT
From: YOSSI INGBER <100320.3653@CompuServe.COM>
Subject: irrigation frequency
A few cycles a day method requires short start-up time of each cycle ,
the CNL dripper by NETAFIM ( Compensated Non Leakage ) answers that
requirement . The internal mechanism shuts - off the outlet when the pressure
drops , thus leaving the pipes full of water at the cycle end .
Yossi Ingber
Engineering and Technical Support
Netafim-Magal
ISRAEL
Date: Wed, 8 May 1996 09:45:22
From: txgator@ct.net (Jim Brigham)
Subject: Re: SDI herbicide impregnated emitters
In article Hector Valenzuela <hector@hawaii.edu> writes:
>Date: Mon, 29 Apr 1996 15:38:23 -0500
>Reply-To: <trickle-l@unl.edu>
>From: Hector Valenzuela <hector@hawaii.edu>
>Subject: SDI herbicide impregnated emitters
>Could someone refer me to suppliers which provide herbicide impregnated
>emitter SDI systems? Thank-you. Hector.
>Hector Valenzuela
>Vegetable Extension Specialist
>Horticulture, University of Hawaii at Manoa
>hector@hawaii.edu
>http://agrss.sherman.hawaii.edu/hort/
Whoile herbicide impregnated emitters are manufactured, Gowan chemical has
recently acquired EPA labels for injection of their product, Trifluralin-5,
for the purpose of root intrusion control in SDI systems. You may check with
your local chemical distributor.
>
End of Digest
************************
From root@crcnis1.unl.edu Fri May 10 01:22 EDT 1996
Date: Fri, 10 May 1996 00:11:46 -0500
Message-Id: <199605100511.AA04370@crcnis1.unl.edu>
Errors-To: rmead@asrr.arsusda.gov
Reply-To: <trickle-l@unl.edu>
To: Multiple recipients of list <trickle-l@unl.edu>
Subject: TRICKLE-L digest 494
Contents:
Re: TRICKLE-L digest 491 (TPiatkowsk@aol.com)
Date: Fri, 10 May 1996 01:16:57 -0400
From: TPiatkowsk@aol.com
Subject: Re: TRICKLE-L digest 491
Fe CLOGGING
OUR COMPANY IS ENGAGED IN THE TRANSFER OF SOME VERY INTERESTING TECHNOLOGY
FROM THE COMMERCIAL WATER TREATMENT INDUSTRY TO AGRICULTURE.
ONE SUCH FORMULATION HAS SHOWN THE ABILITY TO COMBAT THE PROBLEMS ASSOCIATED
WITH IRON IN THE WATER AND IRON RELATED BACTERIA.
IN CALIFORNIA WE ARE EXPERIENCING SUCCESS MAINTAINING DRIP SYSTEMS IN THE
PRESENCE OF HIGH LEVELS OF IRON WITHOUT THE NECESSITY TO USE RESERVOIRS TO
REMOVE THE IRON.
IF YOU WOULD LIKE MORE INFORMATION PLEASE EMAIL.
End of Digest
************************
From root@crcnis1.unl.edu Sat May 11 01:22 EDT 1996
Date: Sat, 11 May 1996 00:11:51 -0500
Message-Id: <199605110511.AA00212@crcnis1.unl.edu>
Errors-To: rmead@asrr.arsusda.gov
Reply-To: <trickle-l@unl.edu>
To: Multiple recipients of list <trickle-l@unl.edu>
Subject: TRICKLE-L digest 495
Contents:
Acid injection ("Jerry Neufeld" <jneufeld@fs.scs.unr.edu>)
Re: TRICKLE-L digest 491 ("James W. Troutt" <jtroutt@mail.orion.org>)
Date: Fri, 10 May 96 09:30:39 PST
From: "Jerry Neufeld" <jneufeld@fs.scs.unr.edu>
Subject: Acid injection
Can anyone reccomend a positive displacement injection pump capable of
injecting sulfuric acid into a SDI system? I need to inject roughly 3
oz. per minute into a 60 psi line.
Jerry Neufeld
jerry@scs.unr.edu
(702) 635-6656
Date: Fri, 10 May 1996 15:01:55 -0500 (CDT)
From: "James W. Troutt" <jtroutt@mail.orion.org>
Subject: Re: TRICKLE-L digest 491
i need more information about removing iron from well water
as we hav here in the Ozarks.
jwt
End of Digest
************************
From root@crcnis1.unl.edu Mon May 13 03:17 EDT 1996
Date: Mon, 13 May 1996 02:05:42 -0500
Message-Id: <199605130705.AA05935@crcnis1.unl.edu>
Errors-To: rmead@asrr.arsusda.gov
Reply-To: <trickle-l@unl.edu>
To: Multiple recipients of list <trickle-l@unl.edu>
Subject: TRICKLE-L digest 497
Contents:
Re: TRICKLE-L digest 495 (TPiatkowsk@aol.com)
Date: Mon, 13 May 1996 03:07:54 -0400
From: TPiatkowsk@aol.com
Subject: Re: TRICKLE-L digest 495
With regard to Fe in the water.
Enclosed is a brief description of how we approach the problems associated
with both the presence of Fe and Fe related bacteria as they occur within a
drip systems. It must be recognized that if iron is present in the source
water at levels > .2 ppm, there exists the potential for problems. By
applying an approach used within the commercial water treatment industry, one
can manage Fe problems without the need for reservoirs.
It is recognized that Fe and the related bacteria cannot be totally
eliminated from the source water. However, it is our experience that under
most conditions, one can efficiently manage and avoid problems. By
analyzing the source water one can determine the Fe level and the quality of
the source water. Observations of the well, generally, will indicate if iron
is a problem .
It is important to consider the overall function of the irrigation system.
Factors such as gypsum injection and fertigation can influence the occurrence
of problems. After collecting this information the following procedure is
followed:
We are assuming the following for this example: There is Fe in the source
water at 1ppm and the water has a total hardness of 450 ppm (asCaCO3).
Evidence of the presence of Fe slime is present. Keeping in mind, each
situation is different.
The well should be chemically cleaned to kill the bacteria present in the
well casing and remove built up scale. Recognizing that the source of the
bacteria may very well be the aquifer itself, one cannot expect to sterilize
the well. But, by removing the scale within the casing, primarily within the
tidal portions exposed to air during draw down, the habitat is greatly
reduced for the bacteria and in cases where well output was restricted due to
excessive scale buildup, flow from the well can be improved. This cleaning
can be accomplished with a combination of chemicals that are formulated to be
both metal and environmentally safe.
Once the well has been cleaned, the focus moves to cleaning the drip tape and
system from the previous exposure to Fe and slime forming bacteria. It is
recommended and most economical to address this problem with conventional
acid washes and flushing. The pH should be lowered to between 3-4 to
effectively clean. Caution to prolonged exposure to metal valves etc. should
be exercised.
The next step is to treat the water as it discharges from the pump or booster
prior to it entering the filter station. By looking at the water analysis it
is possible to determine the rate of injection required to maintain a clean
running system. We use a phosphonate based product that is approved for use
with drinking water at levels generally 2-4 times our injection levels. The
product has been formulated to address the problems associated with bio-films
and slime. It is injected into the system at maintenance levels between .8
and 2 ppm. (in California), is affordable and eliminates the need for
chlorine and acid.
It is our experience that by injecting upstream of the filter station the
treated water will clean the filters and screens of previously deposited Fe
and biological contamination. This is not a fast process but it is constant.
The properties of phosphonates are properly suited for this application. They
are powerful and used at very low levels. They are not pH dependent. Their
action is one reflecting thresh hold chemistry and effective activity can be
maintained throughout the complete irrigation system. As Ca regulators,
treatment of the water can enhance the effectiveness of gypsum injections and
fertigation. Problems are most commonly observed when Fe is in the source
water, hardness is at least marginal and the system is equipped with
fertigation and gypsum injection equipment.
Fe, problems can be aggregated by other factors. It has also been observed
when drip systems are installed on wells sized and equipped to handle larger
outputs than required for the drip system, Fe problems can develop.
This approach to problem does not replace the need to properly flush lines.
When servicing existing or old systems, flushing may be required more
frequently for the initial phases of treatment. These are practices unique to
each situation and should be dealt with accordingly.
The well cleaning and installation of the water treatment injection system
can be accomplished within two to three days.
I hope information has been of value. If you require further detail please
e-mail me your address and information will be sent .
Ag H2O
End of Digest
************************
From root@crcnis1.unl.edu Tue May 14 03:18 EDT 1996
Date: Tue, 14 May 1996 02:06:17 -0500
Message-Id: <199605140706.AA00686@crcnis1.unl.edu>
Errors-To: rmead@asrr.arsusda.gov
Reply-To: <trickle-l@unl.edu>
To: Multiple recipients of list <trickle-l@unl.edu>
Subject: TRICKLE-L digest 498
Contents:
Unsubscribe (Michael Orfanedes <morfaned@cce.cornell.edu>)
Date: Mon, 13 May 1996 12:47:14 -0400 (EDT)
From: Michael Orfanedes <morfaned@cce.cornell.edu>
Subject: Unsubscribe
Unsubscribe trickle-L michael orfanedes
Michael Orfanedes CENET: Michael_Orfanedes
Area Extension Specialist INTERNET: michael_orfanedes@cce.cornell.edu
Cornell Cooperative Extension phone: (716) 652-5453
21 S. Grove St. FAX: (716) 652-5073
East Aurora, NY 14052-2398
End of Digest
************************
From root@crcnis1.unl.edu Wed May 15 03:18 EDT 1996
Date: Wed, 15 May 1996 02:06:35 -0500
Message-Id: <199605150706.AA28446@crcnis1.unl.edu>
Errors-To: rmead@asrr.arsusda.gov
Reply-To: <trickle-l@unl.edu>
To: Multiple recipients of list <trickle-l@unl.edu>
Subject: TRICKLE-L digest 499
Contents:
New member's intro (Richard Mead <rmead@asrr.arsusda.gov>)
Re: Unsubscribe (Paco Rodriguez <pacoro19@us.net>)
How much water? (Richard Anderson <71203.3075@CompuServe.COM>)
Date: Tue, 14 May 1996 10:39:21 -0400
From: Richard Mead <rmead@asrr.arsusda.gov>
Subject: New member's intro
Another new member, Jean E.H. Piaget from South Africa has sent the following.
Welcome Jean!
1) Briefly, what is your affiliation with trickle/drip irrigation?
>I was the first soil scientist in South Africa to advocate and introduce
>the newly developed Micro-Jets to local fruit farmers in the late sixties.
>From 1967 I was the specialist irrigation adviser in the Dept. of Agriculture
>During that time I introduced into SA the planting of vines under
>plastic sheeting, the use of gypsum for soil amelioration, the chlorination
>of micro & drip lines and the use of tensiometers for sheduling purposes.
> I somehow also became National President of the SA Irrigation Institute.
>Since my retirement late 1993 I have stayed in the irrigation field as
>" Piaget Consultancy " working from home.
2) What crops or plants do you use drip irrigation on?
>"local" meaning in the Western Cape producing export apples, pears,
>apricots, plums citrus and table grapes. Export by air or by ships from
>Cape Town, mainly to Europe but also to the USA , Canada & Far East.
3) If using subsurface drip irrigation, what is the average depth of
placement of the drip lateral?
>Most fruit producers use micro sprinklers as drip is usually not
>suitable on our soils* but new developments in the drip field are catching on.
7) Do you have water quality problems? If so, how do you tackle the situation?
>What problems with drip and water ? We have them all!!!but not the
>solutions, some of which I still hope to find in your pages & list.
10) Are you pleased with the uniformity of your system or systems? Were they
designed correctly?
>Correct design is based on norms set up by the Irrigation Institute in
>cooperation with the Directorate of Agr. Engineering of the Dept of Agric.
11) How did you find out about our mailing list?
>I recently became cyberfied, accessed the www and naturally looked for
>"micro irrigation " which ultimately led me to your page.
------
* Jean, does this mean low infiltration soils or other problems?
R. Mead
Trickle-L & MIF owner/manager
http://www.cybergate.com/~rmead
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Date: Tue, 14 May 1996 15:34:21 -0400
From: Paco Rodriguez <pacoro19@us.net>
Subject: Re: Unsubscribe
Unsubscribe
Date: 15 May 96 02:06:06 EDT
From: Richard Anderson <71203.3075@CompuServe.COM>
Subject: How much water?
I am planning a drip system for a small apple orchard planted on M9 rootstock.
Located on San Juan Island, Washington State, Our summers are dry, warm in the
70-80s. In my research, I found several formulas for calculating daily water
requirements, and am interested is understanding which one to use for planning.
A guide published by Raintree suggests a formula that looks like this:
.4893 * D2 * PF * ETO
------------------------------
EF
Where .4893 is a conversion factor
D2 is trees canopy diameter feet squared, used 25.
PF is plant factor, used .70 from the Raintree tables(small trees)
ETo is Evapotranspiration rate, used .20
EF is watering efficiency (decimal equivalent), used .90
This yields 1.90 gal per day for each tree.
Another formula published by Washington State University in a irrigation short
course (Tree Fruit Irrigation, 1994) looks like this;
ETo
.623 * ----- * D2
EF
and yields 3.46 gallons per day when I plug in the Eto, canopy area and
efficiency rate used in the first formula.
Which is correct? Am I applying these formulas correctly? being an beginner at
this, I would appreciate any help, from experienced hands and field knowledge.
Richard Anderson, Westcott Bay Orchards
End of Digest
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From root@crcnis1.unl.edu Thu May 16 08:52 EDT 1996
Date: Thu, 16 May 1996 07:41:25 -0500
Message-Id: <199605161241.AA28535@crcnis1.unl.edu>
Errors-To: rmead@asrr.arsusda.gov
Reply-To: <trickle-l@unl.edu>
To: Multiple recipients of list <trickle-l@unl.edu>
Subject: TRICKLE-L digest 500
Contents:
Returned message (funt.1@osu.edu (Richard Funt))
Date: Thu, 16 May 1996 07:23:21 -0500
From: funt.1@osu.edu (Richard Funt)
Subject: Returned message
Richard,
Yesterday , I tried to send a message to Mr. Anderson and the
message was returned indicating I was not a part of tricle-l and had to
subscribe. I had a similar problem of receiving duplicate message several
months ago. The problem lies in that I have two addresses - one for the
university and with the college. I believe that yesterdays problem occurred
with the university address. How do I send my message and how do I keep one
address?
Thanks
Dick Funt
End of Digest
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Prepared by Steve Modena, AB4EL.
Comments and suggestions to: modena@SunSITE.unc.edu