This is the compendium of AGMODELS-L digests for March 1996.
It was prepared from the daily digest mailings. Some digests
may be missing, because occasional mailings are lost en route.
Contents: Introduction and query (William Powers .<.wjp@xdiv.lanl.gov.>.) <---------------------------------------------------------------------->
Date: Wed, 6 Mar 1996 11:39:10 -0700 From: William Powers .<.wjp@xdiv.lanl.gov.>. Subject: Introduction and query I presently work at Los Alamos National Laboratory. My expertise lies in remote sensing through the atmosphere and have in the recent past been involved with the development of vegetative canopy models. Such models produce reflection signatures (BRDF) that are of use to the remote sensing community. For funding reasons, I have had little recent opportunity to do such research. Additionally, I am presently involved with a laboratory outreach program called The Supercomputing Challenge. The group of high school students that I am working with are interested in the last ice age and what affect such an ice age would have on modern America. In this regard, I am looking for relatively simple crop yield models. The idea is to be able, knowing precipitation, solar flux, etc., what yields (in a rather coarse sense) could be expected. Of course, I will eventually need to find some sort of mapping of farm soil fertility in present day America. Any help would be greatly appreciated. Thanks, bill powers <------------------------------>
End of Digest ************************
Contents: Remote sensing and yield prediction (Marco Mariotti .<.marcom@pisa.ccr.it.>.) <---------------------------------------------------------------------->
Date: Thu, 7 Mar 96 18:36:50 +0100 From: Marco Mariotti .<.marcom@pisa.ccr.it.>. Subject: Remote sensing and yield prediction Bill, I think that the pubblication: "Bouman B.A.M., 1995. Crop modelling and remote sensing for yield prediction. Netherlands Journal of Agricoltural Science, 43: 143-161." could give to you some indications. Marco Mariotti (marcom@pisa.ccr.it) <------------------------------>
End of Digest ************************
Contents: Remote sensing and yield prediction (Marco Mariotti .<.marcom@pisa.ccr.it.>.) Remote sensing and yield prediction (Marco Mariotti .<.marcom@pisa.ccr.it.>.) Re: Introduction and query (NeptuneSys@aol.com) <---------------------------------------------------------------------->
Date: Thu, 7 Mar 96 23:35:05 +0100 From: Marco Mariotti .<.marcom@pisa.ccr.it.>. Subject: Remote sensing and yield prediction Bill, I think that the pubblication: "Bouman B.A.M., 1995. Crop modelling and remote sensing for yield prediction. Netherlands Journal of Agricoltural Science, 43: 143-161." could give to you some indications. Regards, Marco Mariotti <------------------------------>
Date: Fri, 8 Mar 96 13:58:35 +0100 From: Marco Mariotti .<.marcom@pisa.ccr.it.>. Subject: Remote sensing and yield prediction Reply to introdution and query by William Powers Bill, I think that the pubblication: "Bouman B.A.M., 1995. Crop modelling and remote sensing for yield prediction. Netherlands Journal of Agricoltural Science, 43: 143-161." could give to you some indication. Regards, Marco Mariotti <------------------------------>
Date: Fri, 8 Mar 1996 09:02:30 -0500 From: NeptuneSys@aol.com Subject: Re: Introduction and query You should check with NASA in Houston. Ask about the Large Area Crop Inventory Experiment (LACIE). This was done in the late 70s by the Earth Observation Division. Jim Allison <------------------------------>
End of Digest ************************
Contents:
("Alberto Salinas G." .<.dsalinas@sol.racsa.co.cr.>.)
<---------------------------------------------------------------------->
Date: Sat, 9 Mar 1996 09:20:19 +0600 (GMT)
From: "Alberto Salinas G." .<.dsalinas@sol.racsa.co.cr.>.
Subject:
RayChasse@aol.com
I invite all of you to check with Dr. Ray Chasse on the University on Line.
It may be of your interest. Just mention that A.Salinas suggested you to
make this contact.
ADRSG
<------------------------------>
End of Digest
************************
Contents: Re: Reminder: Crop Simulation Workshop (wwilhelm@unl.edu (Wally Wilhelm)) <---------------------------------------------------------------------->
Date: Mon, 11 Mar 1996 11:16:26 -0600 From: wwilhelm@unl.edu (Wally Wilhelm) Subject: Re: Reminder: Crop Simulation Workshop Earlier I indicated I would be submitting an abstract for the Crop Simulation Workshop. My plans have changed. I will NOT be presenting a paper, or preparing and abstract, for the workshop. I will, however, attend the meeting. Best wishes, Wally Wilhelm <------------------------------>
End of Digest ************************
Contents:
RE: Reminder: Crop Simulation Workshop (Jon Hanson .<.jon@gpsr.colostate.edu.>.)
Crop Simulation Workshop ("Donald MacKerron" .<.DMACKE@scri.sari.ac.uk.>.)
Canopy interception (muttiah@brcsun0.tamu.edu (Ranjan Muttiah))
(Ed Davey .<.edavey@hookup.net.>.)
(madjid.bouzit@cemagref.fr (Madjid BOUZIT))
<---------------------------------------------------------------------->
Date: Mon, 11 Mar 1996 13:47:24 -0700
From: Jon Hanson .<.jon@gpsr.colostate.edu.>.
Subject: RE: Reminder: Crop Simulation Workshop
------ =_NextPart_000_01BB0F51.480B7A60
Content-Type: text/plain; charset="us-ascii"
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Sorry you will not presenting a paper. I hope to see you at the workshop.
Jon Hanson
Workshop Coordinator
----------
From: Wally Wilhelm[SMTP:wwilhelm@unl.edu]
Sent: Monday, March 11, 1996 10:27 AM
To: Multiple recipients of list
Subject: Re: Reminder: Crop Simulation Workshop
Earlier I indicated I would be submitting an abstract for the Crop
Simulation Workshop. My plans have changed. I will NOT be presenting a
paper, or preparing and abstract, for the workshop. I will, however,
attend the meeting.
Best wishes,
Wally Wilhelm
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<------------------------------>
Date: Tue, 12 Mar 1996 08:32:50 GMT
From: "Donald MacKerron" .<.DMACKE@scri.sari.ac.uk.>.
Subject: Crop Simulation Workshop
Wally,
So you won't be at the Simulation Workshop?
Why tell all of us?
Most of us will not be affected by your absence.
We will not be there either.
Please send directed messages to the person you want to address.
It will save 300 of us from deleting your unwanted message.
Laziness in directing messages - and you are just the person unlucky
enough to attract my wrath - is just like standing in the office
corridor and SHOUTING ALL YOUR BUSINESS, regardless of others.
Donald MacKerron
Best wishes,
Donald MacKerron
Tel: +44 (0)1382 562731
FAX: +44 (0)1382 562426
<------------------------------>
Date: Tue, 12 Mar 1996 08:38:43 -0600
From: muttiah@brcsun0.tamu.edu (Ranjan Muttiah)
Subject: Canopy interception
Does anyone know the name of the canopy interception/ET
model by J. Gash ? where can I get a copy ?
Any references to any other model would be appreciated.
muttiah@brcsun0.tamu.edu
<------------------------------>
Date: Tue, 12 Mar 1996 11:37:57 -0500
From: Ed Davey .<.edavey@hookup.net.>.
Subject:
unsubscribe
<------------------------------>
Date: Tue, 12 Mar 1996 17:43:15 +0100
From: madjid.bouzit@cemagref.fr (Madjid BOUZIT)
Subject:
unsubscribe
<------------------------------>
End of Digest
************************
Contents: Asparagus Harvest (David Donaldson .<.davidd@sea.ar.ispnet.com.>.) (Fedel Juraj .<.fedel@afnet.uniag.sk.>.) RE: Asparagus Harvest (ypachepsky@asrr.arsusda.gov) <---------------------------------------------------------------------->
Date: Tue, 12 Mar 1996 17:01:21 -0600 From: David Donaldson .<.davidd@sea.ar.ispnet.com.>. Subject: Asparagus Harvest Now, here is a practical problem that someone may like to tackle. Project your imagination into the following situation. You are growing asparagus in the central US. You have a limited labor force to harvest the crop You must inform your buyers as to your harvest schedule. (They can buy from the El Centro or Salinas, California areas{stable temp areas} instead of from you) Last year, the fluctuating air temperatures from day to day seemed to raise havoc with any harvest and selling schemes applied. Finally you decided to get your crew out every day and cut every spear unto exhaustion. Here are the tools at your disposal. Air thermometer, soil probe thermometer, rulers to measure spear growth. A degree in Mathematics but no experience in ag trial research or statistical analysis. NOW, finally, can an empirical formula be developed that would relate air temperature changes, soil temperature changes, asparagus plant response? What would be some of the underlying assumptions as to those relationships. (i.e. do underground parts have a power relationship to soil temperature)? A professor Marr at the University of Kansas published a linear formula that seemed to fall apart when I tried to apply it. If you think this problem worthy of further work please let me know. You might vector me to some tools or research to help solve the problem. If you think there is no practical field solution or that it is all a bunch of silliness, I believe I could tolerate that answer too. >From David [several weeks away from being up to my ass in Asparagus] Donaldson <------------------------------>
Date: Wed, 13 Mar 1996 15:15:43 +0100 (MET) From: Fedel Juraj .<.fedel@afnet.uniag.sk.>. Subject: unsubscribe <------------------------------>
Date: Wed, 13 Mar 96 09:36:37 PST From: ypachepsky@asrr.arsusda.gov Subject: RE: Asparagus Harvest This vividly reminds me a problem I've got during an admission test: you have a stopwatch and a thermometer and you have to measure a height of a tower. Any suggestions? ---------------Original Message--------------- Now, here is a practical problem that someone may like to tackle. Project your imagination into the following situation. You are growing asparagus in the central US. You have a limited labor force to harvest the crop You must inform your buyers as to your harvest schedule. (They can buy from the El Centro or Salinas, California areas{stable temp areas} instead of from you) Last year, the fluctuating air temperatures from day to day seemed to raise havoc with any harvest and selling schemes applied. Finally you decided to get your crew out every day and cut every spear unto exhaustion. Here are the tools at your disposal. Air thermometer, soil probe thermometer, rulers to measure spear growth. A degree in Mathematics but no experience in ag trial research or statistical analysis. NOW, finally, can an empirical formula be developed that would relate air temperature changes, soil temperature changes, asparagus plant response? What would be some of the underlying assumptions as to those relationships. (i.e. do underground parts have a power relationship to soil temperature)? A professor Marr at the University of Kansas published a linear formula that seemed to fall apart when I tried to apply it. If you think this problem worthy of further work please let me know. You might vector me to some tools or research to help solve the problem. If you think there is no practical field solution or that it is all a bunch of silliness, I believe I could tolerate that answer too. >From David [several weeks away from being up to my ass in Asparagus] Donaldson ----------End of Original Message---------- ------------------------------------- Name: yakov pachepsky E-mail: ypachepsky@asrr.arsusda.gov (yakov pachepsky) USDA:ARS:BA:NRI:RMSL Bldg 007 Rm 008 BARC-WEST Beltsville, MD 20705 Tel 301-504-74-68 Fax 301-504-58-23 ------------------------------------- <------------------------------>
End of Digest ************************
Contents:
RE: Asparagus Harvest (Stephen Rawlins .<.srawlins@ncw.net.>.)
Koc values for desethylatrazine ("David A Eckhardt, Hydrologist (Geol), Ithaca, NY ".<.daeckhar@usgs.gov.>.)
Yield estimation in vegetable crops. (BOISVERTJ@ncccot.agr.ca)
RE: Asparagus Harvest (David Donaldson .<.davidd@sea.ar.ispnet.com.>.)
RE: Asparagus Harvest (rama@brcsun0.tamu.edu (Ramanarayanan Tharacad))
RE: Asparagus Harvest (David Donaldson .<.davidd@sea.ar.ispnet.com.>.)
RE: Asparagus Harvest (William Powers .<.wjp@xdiv.lanl.gov.>.)
Re: Asparagus Harvest (Jerry Mulliken .<.mulliken@teknetwork.com.>.)
RE: Asparagus Harvest - Clarification (rama@brcsun0.tamu.edu (Ramanarayanan Tharacad))
RE: Asparagus Harvest (lpachepsky@asrr.arsusda.gov)
<---------------------------------------------------------------------->
Date: Wed, 13 Mar 1996 10:09:04 -0800
From: Stephen Rawlins .<.srawlins@ncw.net.>.
Subject: RE: Asparagus Harvest
Drop the thermometer and time how long it takes to reach the ground.
Steve
At 08:45 AM 3/13/96 -0600, you wrote:
>This vividly reminds me a problem I've got during an admission test:
>you have a stopwatch and a thermometer and you have to measure a height of
a tower.
>Any suggestions?
USDA/ARS -- Retired Richland, WA 9352
APPROPRIATE SYSTEMS Phone 509-627-4943
(Precision Farming Consultants) FAX 509-627-1841
2638 Eastwood Avenue Email srawlins@ncw.net
<------------------------------>
Date: Wed, 13 Mar 1996 21:16:32 +0000
From: "David A Eckhardt, Hydrologist (Geol), Ithaca, NY ".<.daeckhar@usgs.gov.>.
Subject: Koc values for desethylatrazine
Does anyone know of values for the organic carbon partition
coefficient (Koc) for desethylatrazine? Citable literature values
would be most welcome! Thanks.
------------------------------------------------------------------
David Eckhardt Tel: (607)266-0217 ext. 3018
U.S. Geological Survey
903 Hanshaw Road Email: daeckhar@usgs.gov
Ithaca, NY 14850-1573 Fax: (607)266-0521
<------------------------------>
Date: 13 Mar 1996 17:33:16 -0400 (EDT)
From: BOISVERTJ@ncccot.agr.ca
Subject: Yield estimation in vegetable crops.
Dear ag-modelers,
I am a new member of this list and my name is Johanne Boisvert.
I am working as a scientist for Agriculture and Agrifood Canada in Ottawa.
I have been involved in soil moisture modelling for several years especially
in irrigation scheduling for mineral soils. Actually I am mostly
involved in radar remote sensing.
We are planning to implement a GIS in an area of vegetable growers on mineral
and organic soils. Among other things, we are interested in yield estimation
on a field basis, for green peas, yellow and green beans, sweet corn,
carrots,onions,celery, brocoli and lettuce.
I have three questions:
==============================
Is any one among you have a model that would predict yield for one or more
of these crops?
Is EPIC or CERES models could be suitable (with adaptation) for these kind
of crops? (I have never worked with these models, just heard about them)
Is any expert in modelling soil moisture in organic soils among you?
Thank you!
Johanne
Room 303, Bldg 74
Central Experimental Farm
Ottawa, On, Canada K1AOC6
613-759-1516
613-996-0646 (fax)
Boisvertj@ncccot.agr.ca
<------------------------------>
Date: Wed, 13 Mar 1996 16:40:14 -0600
From: David Donaldson .<.davidd@sea.ar.ispnet.com.>.
Subject: RE: Asparagus Harvest
I suggested that to Y in a private e-mail, but since Steve has decided to
go public with MY solution, I suggest that we drop a graduate student from
the tower and let him or her shout out the seconds from the watch until he
or she (notice how politically correct I am) hits the ground. If they could
drive the thermometer into the ground at the same time perhaps we could get
our first soil temp measurement for the Asparagus problem.
David (will send the solution provider a large box of fresh chilled
Asparagus or a gift certificate) Donaldson
----------
From: Stephen Rawlins[SMTP:srawlins@ncw.net]
Sent: Wednesday, March 13, 1996 12:10 PM
To: Multiple recipients of list
Subject: RE: Asparagus Harvest
Drop the thermometer and time how long it takes to reach the ground.
Steve
At 08:45 AM 3/13/96 -0600, you wrote:
>This vividly reminds me a problem I've got during an admission test:
>you have a stopwatch and a thermometer and you have to measure a height of
a tower.
>Any suggestions?
USDA/ARS -- Retired Richland, WA 9352
APPROPRIATE SYSTEMS Phone 509-627-4943
(Precision Farming Consultants) FAX 509-627-1841
2638 Eastwood Avenue Email srawlins@ncw.net
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Date: Wed, 13 Mar 1996 17:06:07 -0600
From: rama@brcsun0.tamu.edu (Ramanarayanan Tharacad)
Subject: RE: Asparagus Harvest
Man, your guys are cluttering the internet!!
I was thinking only meaningful discussions are going on in this
list!!
I wish you could *cut* the Asparagus out and move on!!
Thanks.
Ramanarayanan
+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+
| T.S. Ramanarayanan PhD | Voice: (817) 770-6680 or 770-6600 |
| Blackland Research Center | Fax: (817) 770-6561 |
| Texas Agricultural Experiment Station | email: rama@brcsun0.tamu.edu |
| 808 East Blackland Road | |
| Temple, TX 76502 | |
+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+
<------------------------------>
Date: Wed, 13 Mar 1996 17:36:40 -0600
From: David Donaldson .<.davidd@sea.ar.ispnet.com.>.
Subject: RE: Asparagus Harvest
Good Grief, R. T., what kinds of automatons do you think there are out
here? Is this such a high traffic, high intellectual density activity that
there is no room for social lubrication and some lightness? Most
communication has a lot of noise and unnecessary verbiage. Your message
just discourages communication without adding anything. The delete key is
handy and just go on with your life. If most of the subscribers to the list
feel as you do, I certainly would never fit in and will cheerfully leave
and won't bother you again.
The other day, I asked a plant pathologist a question via the internet.
When I received a chatty and friendly reply, I not only had my answer, but
I felt that I had met a kindred spirit and made a friend. Why is this bad?
David (out standing in my field) Donaldson
----------
From: Ramanarayanan Tharacad[SMTP:rama@brcsun0.tamu.edu]
Sent: Wednesday, March 13, 1996 5:03 PM
To: Multiple recipients of list
Subject: RE: Asparagus Harvest
Man, your guys are cluttering the internet!!
I was thinking only meaningful discussions are going on in this
list!!
I wish you could *cut* the Asparagus out and move on!!
Thanks.
Ramanarayanan
+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
-=-=-=+
| T.S. Ramanarayanan PhD | Voice: (817) 770-6680 or
770-6600 |
| Blackland Research Center | Fax: (817) 770-6561
|
| Texas Agricultural Experiment Station | email: rama@brcsun0.tamu.edu
|
| 808 East Blackland Road |
|
| Temple, TX 76502 |
|
+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
-=-=-=+
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`
end
<------------------------------>
Date: Wed, 13 Mar 1996 17:22:27 -0700
From: William Powers .<.wjp@xdiv.lanl.gov.>.
Subject: RE: Asparagus Harvest
I agree that the purpose of email is more than informative, as
long as the listserv is not jammed with these kinds of messages.
There is certainly no reason why a mixture of both informative,
factual, and social exchange cannot be sustained.
We should, however, consider in distributing a message to the
group its relevance to the entire group, or whether a smaller
distribution might not better serve all.
bill powers
<------------------------------>
Date: Wed, 13 Mar 1996 21:52:13 CST
From: Jerry Mulliken .<.mulliken@teknetwork.com.>.
Subject: Re: Asparagus Harvest
** Reply to note from David Donaldson .<.davidd@sea.ar.ispnet.com.>. 03/12/96 5:07pm -0600
snip
> A professor Marr at the University of Kansas published a linear formula
> that seemed to fall apart when I tried to apply it.
> If you think this problem worthy of further work please let me know. You
> might vector me to some tools or research to help solve the problem.
> If you think there is no practical field solution or that it is all a bunch
> of silliness, I believe I could tolerate that answer too.
>
Linear? Was there a base temperature?
Perhaps soil temperature would do a better job, at least for bud break and early stalk
growth. There are methods for relating soil temperature to air temperature. These might
be helpful in predicting emergence, and would allow you to forecast soil temp from air
temp. weather forecasts. If asparagus is like a lot of plants, emergence could be
sigmoidal with some base temp. Once emerged, spear growth could well be linear, again
above a base temp. Sum all this on a daily basis and there you have it, as long as
temperature doesn't interact with other environmental variables.
BTW I know nothing about the physiology of asparagus, but I'm glad you're growing it
because we like to eat it.
Jerry Mulliken [mulliken@teknetwork.com]
JM Crop Consulting
<------------------------------>
Date: Thu, 14 Mar 1996 08:54:14 -0600
From: rama@brcsun0.tamu.edu (Ramanarayanan Tharacad)
Subject: RE: Asparagus Harvest - Clarification
I am sorry D.D., I did not complain about the initial Asparagus
question you posed.
Though it was not purely academic, it had some thing to think about -
truely.
I was complaining about the replies for it - the thermometer & stop
clock stuff.
I am not against social lubrication amidst "high intellectual"
discussions. But, if it becomes too lubricated things will start
slipping away!! :-)
Cheers!!
Rama.
+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+
| T.S. Ramanarayanan PhD | Voice: (817) 770-6680 or 770-6600 |
| Blackland Research Center | Fax: (817) 770-6561 |
| Texas Agricultural Experiment Station | email: rama@brcsun0.tamu.edu |
| 808 East Blackland Road | |
| Temple, TX 76502 | |
+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+
<------------------------------>
Date: Thu, 14 Mar 96 10:07:24 PST
From: lpachepsky@asrr.arsusda.gov
Subject: RE: Asparagus Harvest
On Wed, 13 Mar 1996 16:57:47 -0600 Ramanarayanan Tharacad wrote:
>Man, your guys are cluttering the internet!!
>
>I was thinking only meaningful discussions are going on in this
>list!!
>
>I wish you could *cut* the Asparagus out and move on!!
>
>Thanks.
>
>Ramanarayanan
It's a remarkable message, guys! There is a person who is able to
distinguish between meaningful and meaningless discussion! I was always
fascinated how good ideas come to people's mind inspired with an absolutely
irrelevant, sometimes even stupid discussion. Science is a very delicate
matter, I'd not be so brave to declare any kind of discussion meaningless.
And one more thing. It is very easy to *cut* somebody else's asparagus,
isn't it? I'd like to see you cutting your crop and burning your own data.
Cheers, Ludmila
-------------------------------------
Name: Ludmila Pachepsky
Systems Research Lab
Bldg 007, Rm 008 BARC-W
10300 Baltimore Ave.
Beltsville, MD 20705
301-504-6042 (voice)
301-504-5823 (fax)
E-mail: lpachepsky@asrr.arsusda.gov
-------------------------------------
03/14/96 10:07:24
<------------------------------>
End of Digest
************************
Contents:
Re: Koc values for desethylatrazine (DON WAUCHOPE .<.DON@tifton.cpes.peachnet.edu.>.)
RE: Asparagus Harvest - Clarification (Stephen Rawlins .<.srawlins@ncw.net.>.)
Re: Koc values for desethylatrazine ("David A Eckhardt, Hydrologist (Geol), Ithaca, NY ".<.daeckhar@usgs.gov.>.)
RE: Asparagus Harvest - Clarification (David Donaldson .<.davidd@sea.ar.ispnet.com.>.)
RE: Asparagus Harvest - Clarification (lpachepsky@asrr.arsusda.gov)
Re: Asparagus Harvest ("Rabi H. Mohtar" .<.RHM8@PSUVM.PSU.EDU.>.)
Request information for the impacts of changes of farmland use (Ching-pin Tung .<.cptung@hy.ntu.edu.tw.>.)
<---------------------------------------------------------------------->
Date: Thu, 14 Mar 96 14:38:41 EST
From: DON WAUCHOPE .<.DON@tifton.cpes.peachnet.edu.>.
Subject: Re: Koc values for desethylatrazine
On Wed, 13 Mar 1996 15:24:59 -0600 David A Eckhardt, Hydrologist (Geol), Ithaca,
>Does anyone know of values for the organic carbon partition
>coefficient (Koc) for desethylatrazine? Citable literature values
>would be most welcome! Thanks.
>------------------------------------------------------------------
> David Eckhardt Tel: (607)266-0217 ext. 3018
..(snip)
You probably ought to get the original reference but according to my notes
Mills and Thurman in E.S.&T 28:73-79 (1994) measured Kd of deethyl and deiso-
propyl atrazine in a 1% OC soil and got 0.4 and 0.3, respectively leading to
a Koc of 40 and 30. I am assuming "desethyl" equals "deethyl..."
Don Wauchope
<------------------------------>
Date: Thu, 14 Mar 1996 11:48:48 -0800
From: Stephen Rawlins .<.srawlins@ncw.net.>.
Subject: RE: Asparagus Harvest - Clarification
Rama:
I think we all agree. There is a time and a place for everything, even a
little humor once in a while, if we don't get carried away.
Steve
At 08:46 AM 3/14/96 -0600, you wrote:
>I am sorry D.D., I did not complain about the initial Asparagus
>question you posed.
>Though it was not purely academic, it had some thing to think about -
>truely.
>
>I was complaining about the replies for it - the thermometer & stop
>clock stuff.
>
>I am not against social lubrication amidst "high intellectual"
>discussions. But, if it becomes too lubricated things will start
>slipping away!! :-)
>
>Cheers!!
>
>Rama.
>
>+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+
>| T.S. Ramanarayanan PhD | Voice: (817) 770-6680 or 770-6600 |
>| Blackland Research Center | Fax: (817) 770-6561 |
>| Texas Agricultural Experiment Station | email: rama@brcsun0.tamu.edu |
>| 808 East Blackland Road | |
>| Temple, TX 76502 | |
>+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+
>
>
USDA/ARS -- Retired Richland, WA 9352
APPROPRIATE SYSTEMS Phone 509-627-4943
(Precision Farming Consultants) FAX 509-627-1841
2638 Eastwood Avenue Email srawlins@ncw.net
<------------------------------>
Date: Thu, 14 Mar 1996 21:36:39 +0000
From: "David A Eckhardt, Hydrologist (Geol), Ithaca, NY ".<.daeckhar@usgs.gov.>.
Subject: Re: Koc values for desethylatrazine
Thanks Don, I will get that reference tomorrow. These Koc values
are within the range of Michael Barrett's reply, below. -Dave
On Thu, 14 Mar 1996 13:47:32 -0600
DON WAUCHOPE said:
> On Wed, 13 Mar 1996 15:24:59 -0600 David A Eckhardt, Hydrologist (Geol),
Ithaca,
> >Does anyone know of values for the organic carbon partition
> >coefficient (Koc) for desethylatrazine? Citable literature values
> >would be most welcome! Thanks.
> >------------------------------------------------------------------
> > David Eckhardt Tel: (607)266-0217 ext. 3018
> ..(snip)
> You probably ought to get the original reference but according to my
notes
> Mills and Thurman in E.S.&T 28:73-79 (1994) measured Kd of deethyl and
deiso-
> propyl atrazine in a 1% OC soil and got 0.4 and 0.3, respectively
leading to
> a Koc of 40 and 30. I am assuming "desethyl" equals "deethyl..."
> Don Wauchope
Return-Path: BARRETT.MICHAEL@EPAMAIL.EPA.GOV
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id AA826823031; Thu, 14 Mar 96 08:07:00 EST
Date: Thu, 14 Mar 96 08:07:00 EST
Message-Id: .<.9602148268.AA826823031@lancelot.rtptok.epa.gov.>.
To: "David A Eckhardt, Hydrologist (Geol), Ithaca, NY" .<.daeckhar.>.
Cc: BARRETT.MICHAEL@EPAMAIL.EPA.GOV,
Elizabeth_Behl_at_RTPCCHUB@lancelot.rtptok.epa.gov
Subject: Koc values for desethylatrazine
From: "David A Eckhardt, Hydrologist (Geol), Ithaca, NY
".<.daeckhar@usgs.gov.>.
To: .<.agmodels-l@unl.edu.>.
Subject: Koc values for desethylatrazine
David, there are published data and unpublished data on
this. While the data submitted to EPA to support pesticide
registrations are not fully published, they have been
summarized in the EFGWB one-liner database (unfortunately
the current version is not available at the moment due to
budget and other problems, but it will be eventually
accessible on-line). I have just finished a paper on the
mobility and persistence of degradates of atrazine and
several other herbicides, with a pretty good list of
references. Would you like a prepublication copy? (Most
desethylatrazine Koc measurements are in the 20 to 50
range).
Please give me a call at your convenience.
Michael Barrett
Senior Chemist
US EPA
Washington, DC 20460
Ph. (703)305-6391
MESSAGE SENT IN RESPONSE TO:
"Does anyone know of values for the organic carbon partition
coefficient (Koc) for desethylatrazine? Citable literature values
would be most welcome! Thanks.
------------------------------------------------------------------
David Eckhardt Tel: (607)266-0217 ext. 3018
U.S. Geological Survey
903 Hanshaw Road Email: daeckhar@usgs.gov
Ithaca, NY 14850-1573 Fax: (607)266-0521"
------------------------------------------------------------------
David Eckhardt Tel: (607)266-0217 ext. 3018
U.S. Geological Survey
903 Hanshaw Road Email: daeckhar@usgs.gov
Ithaca, NY 14850-1573 Fax: (607)266-0521
<------------------------------>
Date: Thu, 14 Mar 1996 17:15:26 -0600
From: David Donaldson .<.davidd@sea.ar.ispnet.com.>.
Subject: RE: Asparagus Harvest - Clarification
Dear R.T. and Group:
Thank you for the kind words. I will continue to monitor the list for the
benefit I may gain. I will only speak if I think I can contribute something
meaningful. (I have no deep knowledge of model building)
David Donaldson
".........A soft word turneth away wrath"
begin 600 WINMAIL.DAT
M>)\^(BP7`0:0" `$```````!``$``0>0!@`(````Y 0```````#H``$-@ 0`
M`@````(``@`!!) &`!0!```!````# ````,``# #````"P`/#@`````"`?\/
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M"H4B+BLF_D$E$0& '<,=, AP(2 =0$4;0'
Date: Thu, 14 Mar 96 18:11:43 PST
From: lpachepsky@asrr.arsusda.gov
Subject: RE: Asparagus Harvest - Clarification
Dear David,
It seems necessary to recall the common point: Agmodeling is meaningful
only if based on a deep knowledge of real crops. Modelers benefit the most
when learn from those who work with a real crop. Please never hesitate to
benefit no matter if some of us will consider it meaningless. I apologize
for them before you, many of us will do the same.
Ludmila
-------------------------------------
Name: Ludmila Pachepsky
Systems Research Lab
Bldg 007, Rm 008 BARC-W
10300 Baltimore Ave.
Beltsville, MD 20705
301-504-6042 (voice)
301-504-5823 (fax)
E-mail: lpachepsky@asrr.arsusda.gov
-------------------------------------
03/14/96 18:11:43
<------------------------------>
Date: Thu, 14 Mar 96 21:07 EST
From: "Rabi H. Mohtar" .<.RHM8@PSUVM.PSU.EDU.>.
Subject: Re: Asparagus Harvest
Dear David:
You may want to develop your own on-farm regression equations that unfortunatly
will only be of use for future prediction. Most of regression models linear a
nd non linear would require some sort of site calibration. I suggest start tak
ing growth and air temperatures for future use. The following might be of help
:
Plant response to temperature ... by Verwijst and Von Firicks, 1994, Environmen
tal and Experimental Botany, Vol, 34 No. 1 pp 69-74
A non linear model for crop development as a function of temperature, Yin et al
. 1995, Ag. and Forest Meteorology 77 1-16.
Best luck,
Rabi
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Rabi H. Mohtar internet:rhm8@psuvm.psu.edu
The Pennsylvania State University phone: (814) 865-2971
208 Agricultural Engineering Building fax: (814) 863-1031
University Park, PA 16802 "change begins with me"
<------------------------------>
Date: Fri, 15 Mar 1996 17:33:29 +0800
From: Ching-pin Tung .<.cptung@hy.ntu.edu.tw.>.
Subject: Request information for the impacts of changes of farmland use
I am interested in the impacts of changes of farmland use on ecology. I am
wondering whether there is any good reference or book available.
If you have any commend or any idea about this subject, you are very welcome
to drop message in my mailbox. Thanks in advance!
Ching-pin Tung
Associate Researcher
National Taiwan University
Taiwan
R.O.C.
<------------------------------>
End of Digest
************************
Contents: stocking rate $ pasture plant density (Toto Sugiharto .<.tsharto@uniwa.uwa.edu.au.>.) <---------------------------------------------------------------------->
Date: Mon, 18 Mar 1996 12:08:11 +0800 From: Toto Sugiharto .<.tsharto@uniwa.uwa.edu.au.>. Subject: stocking rate $ pasture plant density Dear all, Does anyone know of (mathematical) equation relating animal stocking density, pasture biomass at the end of growing season and (potential) pasture plant density at the beginning of the following growing season? Thanks. Cheers, Toto Sugiharto ====================================== Agricultural & Resource Economics The University of Western Australia Nedlands, Perth, WA 6907 Australia Phone: +61 (9) 380 2538 Fax: +61 (9) 380 1098 email: tsharto@uniwa.uwa.edu.au <------------------------------>
End of Digest ************************
Contents:
RE: stocking rate $ pasture plant density ("Gommes, Rene (SDRN)" .<.Rene.Gommes@fao.org.>.)
Re: stocking rate $ pasture plant density (David H White .<.dhw@peg.apc.org.>.)
unsubscribe (DAIRYCOWS@aol.com)
unsubscribe (Fedel Juraj .<.fedel@afnet.uniag.sk.>.)
(Fedel Juraj .<.fedel@afnet.uniag.sk.>.)
<---------------------------------------------------------------------->
Date: Mon, 18 Mar 1996 07:54:00 +0000 (GMT)
From: "Gommes, Rene (SDRN)" .<.Rene.Gommes@fao.org.>.
Subject: RE: stocking rate $ pasture plant density
>Dear all,
>Does anyone know of (mathematical) equation relating animal stocking
density,
>pasture biomass at the end of growing season and (potential) pasture plant
>density at the beginning of the following growing season? Thanks.
>Cheers,
>Toto Sugiharto
This is not quite the answer, nor is it mathematical, but it may be of help.
In Tanzania, people say that you need for one cow as many hectares as there
are months in the dry season. I have always found this is a very nice
shortcut, and it can be used to do some meaningful calculations. Note,
however, that the average Tanzanian cow is probably closer to 0.5 livestock
unit than to 1!
Rene' G.
<------------------------------>
Date: Mon, 18 Mar 1996 20:44 AEST
From: David H White .<.dhw@peg.apc.org.>.
Subject: Re: stocking rate $ pasture plant density
Hi Toto
You asked whether anyone knew of a mathematical equation relating animal
stocking density, pasture biomass at the end of the growing season, and
(potential) pasture plant density at the beginning of the following growing
season.
I would like to take you through this a step at a time, because there will
not be one generic relationship.
I will start by assuming that as you are at the University of Western
Australia you are dealing with subterranean clover dominated pastures on
sandy soils, and that it is a mediterranean environment where the annual
pastures are germinated by autumn rains, that growth is maintained through
winter but mostly takes place in spring until the soils dry out and the
clover flowers and sets seed in October-November. The amount of seed set
will be affected by the biomass towards the end of the growing season.
Animal stocking rate will determine biomass both during and at the end of
the growing season. Biomass in turn will affect intake and the stocking rate
or density that can be supported (nice feedback loop). See the following
papers for more explanation, particularly White et al. (1983).
Graham (G.W.) Arnold (ex-CSIRO, W.A.) did some relevant studies - see for
example (Arnold and Dudzinski 1967, Australian Journal of Agricultural
Research 18, 349-359) - including having a look at the seed pool, which will
be a major factor in determining potential plant density in the following
season - I am not sure if that was ever published. I am aware that there is
still some modelling of the dynamics of subterranean clover pastures within
CSIRO, W.A., but I am not very familiar with it. See also Graham's paper in
the Proceedings of the Australian Society of Animal Production in 1982 for a
framework of a model for a clover-ley system.
White et al. (1983) also estimated the seed pool for annual pastures in
northern Victoria for each year of a simulation in which stocking rate and
date of lambing were the major management variables.
I suggest you also talk to somebody like Kimbal Curtis, a competent
pasture-livestock modeller in W.A. Agriculture, and familiarise yourself
with the GrazPlan/GrassGro model developed by Drs John Donnelly, Mike Freer
and Andrew Moore of the CSIRO Division of Plant Industry.
I hope this helps; the more you start studying grazing systems, the more
complex and intriguing they become. It really depends what the objective of
your overall study is as to how much detail you require.
Further reading:
White, D.H. Nagorcka, B.N. and Birrell, H.A. (1979). Predicting the wool
growth of sheep under field conditions. In "Physiological and environmental
limitations to wool growth". (Ed. J.L. Black and P.J. Reis) (University of
New England Publishing Unit: Armidale) p.139-161.
White, D.H. (1987). Stocking Rate. In "Managed Grasslands B. Analytical
Studies". (Ed. R.W. Snaydon) (Elsevier, Amsterdam), p227-238.
White, D.H., Bowman, P.J., Morley, F.H.W., McManus, W.R. and Filan, S.J.
(1983). A simulation model of a breeding ewe flock. Agricultural Systems
10: 149-189.
Bowman, P.J., White, D.H., Cottle, D.J. and Bywater, A.C. (1993). Simulation
of wool growth rate and fleece characteristics of Merino sheep in southern
Australia. Part 2. Assessment of biological components of the model.
Agricultural Systems 43: 301-321.
Good luck.
David White
c/- Bureau of Resource Sciences | Phone 61 6 272 4741..w
P.O. Box E11 | 61 6 254 5936..h
Queen Victoria Terrace | Fax 61 6 272 4896..w
Canberra, ACT 2600 | dhw@elnino.nric.gov.au
| dhw@acslink.net.au
<------------------------------>
Date: Mon, 18 Mar 1996 07:53:48 -0500
From: DAIRYCOWS@aol.com
Subject: unsubscribe
unsubscribe
<------------------------------>
Date: Mon, 18 Mar 1996 17:52:20 +0100 (MET)
From: Fedel Juraj .<.fedel@afnet.uniag.sk.>.
Subject: unsubscribe
unsubscribe
<------------------------------>
Date: Mon, 18 Mar 1996 18:12:07 +0100 (MET)
From: Fedel Juraj .<.fedel@afnet.uniag.sk.>.
Subject:
unsubscribe
<------------------------------>
End of Digest
************************
AGMODELS-L digest 462 was NOT received <---------------------------------------------------------------------->
Contents:
Multispecies Meta Data publications: would the Core Office ("Robert M. Caldwell" .<.rcaldwel@hawaii.edu.>.)
<---------------------------------------------------------------------->
Date: Fri, 22 Mar 1996 14:49:43 -1000
From: "Robert M. Caldwell" .<.rcaldwel@hawaii.edu.>.
Subject: Multispecies Meta Data publications: would the Core Office
To especially John Ingram,
How much (approximately) did it cost to publish Report No. 2 for the
Wheat Network? My Institute could publish the GCTE 3.4.3 documents, with
editorial review, though I'm not quite sure about the physical quality of
the final product. Hawaii is not the most efficient place to get things
published. Maybe I could budget, in my proposal, to have the publishing
done in Canberra. Is that an option?
Aloha,
Robert M. Caldwell, Cropping Systems
Department of Agronomy and Soil Science
1910 East West Road, Honolulu, HI 96822; (808) 956-6835; FAX: (808) 956-6539
rcaldwel@Hawaii.edu; http://agrss.sherman.hawaii.edu/caldwell/caldwell.htm
(I sponsor mailing lists GCTE3-4-L@Hawaii.edu and CTAHR-L@Hawaii.edu; to
subscribe, send the message: SUBSCRIBE GCTE3-4-L firstName secondName,
or SUBSCRIBE CTAHR-L firstName secondName, to LISTPROC@Hawaii.edu. I also
listen in on mailing lists AGMODELS-L and DSSAT.)
<------------------------------>
End of Digest
************************
Contents:
Grass models (William Powers .<.wjp@xdiv.lanl.gov.>.)
Re: Multispecies Meta Data publications: would the Core Office? ("Robert M. Caldwell" .<.rcaldwel@hawaii.edu.>.)
Advice request - sorry it's long. (peterl@field.medicine.adelaide.edu.au)
Re: Advice request - sorry it's long. (blasina@alfa.ADINET.COM.UY)
<---------------------------------------------------------------------->
Date: Fri, 22 Mar 1996 18:04:20 -0700
From: William Powers .<.wjp@xdiv.lanl.gov.>.
Subject: Grass models
Someone wrote to me last week about a GRASS model for modeling
the growth of grass. I am interested in obtaining such a model.
Unfortunately, I must have inadvertantly deleted his message.
Please, reply again and I promise to contact you.
Thanks for your help,
bill powers
<------------------------------>
Date: Fri, 22 Mar 1996 15:15:06 -1000
From: "Robert M. Caldwell" .<.rcaldwel@hawaii.edu.>.
Subject: Re: Multispecies Meta Data publications: would the Core Office?
At 02:40 PM 3/22/96 -1000, you wrote:
>To especially John Ingram,
> How much (approximately) did it cost to publish Report No. 2 for the
>Wheat Network? My Institute could publish the GCTE 3.4.3 documents, with
>editorial review, though I'm not quite sure about the physical quality of
>the final product. Hawaii is not the most efficient place to get things
>published. Maybe I could budget, in my proposal, to have the publishing
>done in Canberra. Is that an option?
Please let me clarify this (misdirected) message. The Global Change and
Terrestrial Ecosystems (GCTE) core project of the International
Geosphere-Biosphere Programme (IGBP) has published a summary of wheat models
and field data sets that can be used for testing wheat models (i.e., "Model
and Experimental Meta Data", Report No. 2). I hope to produce the same type
of publication for models of weed/crop, tree/crop, and multiple cropping
systems, and I am in the process of developing a research proposal to fund
the work (GCTE Task 3.4.3). Those interested in the modeling of "complex
agroecosystems" will want to stayed tuned for announcements on GCTE Task
3.4.3 activities...
Aloha,
Robert M. Caldwell, Cropping Systems
Department of Agronomy and Soil Science
1910 East West Road, Honolulu, HI 96822; (808) 956-6835; FAX: (808) 956-6539
rcaldwel@Hawaii.edu; http://agrss.sherman.hawaii.edu/caldwell/caldwell.htm
(I sponsor mailing lists GCTE3-4-L@Hawaii.edu and CTAHR-L@Hawaii.edu; to
subscribe, send the message: SUBSCRIBE GCTE3-4-L firstName secondName,
or SUBSCRIBE CTAHR-L firstName secondName, to LISTPROC@Hawaii.edu. I also
listen in on mailing lists AGMODELS-L and DSSAT.)
<------------------------------>
Date: Sat, 23 Mar 1996 21:40:16 +1030 (CST)
From: peterl@field.medicine.adelaide.edu.au
Subject: Advice request - sorry it's long.
G'day ... from Australia.
I am co-ordinating the development of a "virtual laboratory" with
a rural telematics focus, on a 5.000 acre farm, and I need all the
advice I can get ... from both academic and commercially oriented
minds.
Cooperation is a two-way street, so results, contacts and resources
will be shared with those who collaborate.
We have support from high-level international talent (to Distinguished
Professors in academia and "Captains" of industry) ... in fields as
diverse as CompSci, Electronic and Mechanical Engineering, Computer
Simulation, Legal, Accounting, Business Admin, Mapping/Imaging,
Marketing, Telecoms, Environmental and Agricultural Sciences, and
others. We have international allies in the UK, USA, Russia, Asia,
and Europe, and national allies include our largest national bank,
our national phone company, our electric utility, a national transport
company, an aerial spraying company, GPS equipment providers, a tire
company, vehicle/equipment maintainers, an airline, computer companies,
agricultural institutes and universities, business schoools, local and
Federal government at the highest level, national media - and many more.
We need as much help and expertise as we can get ... via E-Mail and a
Net connected Virtual Reality medium we are developing in our main SUN
workstation (64 Mb RAM, 11 Gig of disk space), which is networked to a
high-end PC installed at the farm ... an extension of a medium which our
medical Professor has described as having a "potential to fundamentally
alter the way physicians and scientists communicate..." This medium has
attracted talent to Nobel Laureatte and recent remote testing drew an
offer by an ally, the airline Cathay Pacific, to take a twin-engined
Airbus off the Hong Kong/London leg of one flight and replace it with a
Boeing 747 so we could use our Professor as a test subject via SATCOM
at cruise altitude.
Briefly, I facilitate and coordinate a global group of over 400 PhDs
(mainly CompSci and Engineering) who provide high-level innovation to
international medical research. Almost a year ago I was asked by our
Deputy Telecommunications Industry Ombudsman to consider creating a
high-profile project to bring innovation and attention to rural Australia,
because he is concerned they will be left behind with comms and technology.
We've since expanded our intention so any resulting viable innovations
will be offered to farmers globally, mostly as gifts in the names of our
collaborators and sponsors.
I have chosen this particular farm because of its significant size and
significant remaining natural bushland ... and because the man who owned
it died suddenly, six months ago, leaving a 43 year old widow and two
sons, 15 and 19, to try to carry on. Every aspect of farm development
and environmental sustainability will be considered, from remotely
administered accounting and banking to leading edge international currency
forecasting - from marketing and product alternatives to a variety of
computer simulations and interfaces - from fertilizer and fuel efficiencies
to remote monitoring of things as diverse as electricity consumption
and animal watering equipment.
We intend to create a unique pool of commercial and academic creativity
using the techiniques we have developed to induce innovation in medical
research, and we will adapt text-based information synthesis/dissemination
systems being developed by a medical research team that includes an Oxford
University (UK) Dux for English Literature.
If you feel you have anything to offer, in any way, I'd appreciate a
contact from you. Inital effort will all be voluntary but there is a
very real potential for unique funding arrangements, and an equal
possibility of commercial spin-offs.
I look forward to any offers of help, advice, or collaboration.
Regards
Peter Heffernan
peter@field.medicine.adelaide.edu.au
<------------------------------>
Date: Sat, 23 Mar 1996 11:45:38 -0800
From: blasina@alfa.ADINET.COM.UY
Subject: Re: Advice request - sorry it's long.
I teach Agricultural Economics in the University of Uruguay (Latin America)
I also write in the agricultural section of the main paper of this country.
If is anything that can be useful from my activities here, just let me know.
<------------------------------>
End of Digest
************************
Contents: CERES-Maize (menegot@uni-mdp.edu.ar) <---------------------------------------------------------------------->
Date: Sun, 24 Mar 1996 21:19:26 -0300 From: menegot@uni-mdp.edu.ar Subject: CERES-Maize Hi! I'm a researcher from Universidad Nacional de Mar del Plata, Argentina. At present I'm working with CERES-Maize without water or nutrient limitations, with data from Balcarce, Argentina (c. 38'S). A particular feature of our region is that for summer crops, temperatures are lower than those reported at the same latitude in the Norhern Hemisphere. I have noticed that, for very early or very late seeding dates, when temperature is low, the model gives important estimation biases in dry weight, yield and its components. Have you noticed this kind of problems somewhere else? Thanks in advance, Pablo Abbate UI-Balcarce Argentina. <------------------------------>
End of Digest ************************
Contents: Re: CERES-Maize (Tom Hodges .<.thodges@tricity.wsu.edu.>.) Re: CERES-Maize (Lianhai Wu .<.Lianhai.Wu@mv.slu.se.>.) Windows '95 or NT and DOS Based Models (John_P._Carbone@rohmhaas.com (John P. Carbone)) <---------------------------------------------------------------------->
Date: Sun, 24 Mar 1996 20:55:47 -0800 (PST) From: Tom Hodges .<.thodges@tricity.wsu.edu.>. Subject: Re: CERES-Maize When I ran ceres-maize for US corn belt states, cool fall weather made it keep going and going and going ... unless a hard frost stopped the model. Finally I put in some stuff to shut it down after a number of cool days -- that helped. Tom Hodges, Cropping Systems Modeler USDA-ARS email: thodges@tricity.wsu.edu 24106 N Bunn Road voice: 509-786-9207 Prosser, WA 99350 USA Fax: 509-786-9370, 509-786-9277 == HomePage http://www.tricity.wsu.edu/htmls/hodges == == ## Rent this space for your HomePage ## == If this represents anything, it is only my opinion. On Sun, 24 Mar 1996 menegot@uni-mdp.edu.ar wrote: > Hi! I'm a researcher from Universidad Nacional de Mar del Plata, Argentina. > At present I'm working with CERES-Maize without water or nutrient > limitations, with data from Balcarce, Argentina (c. 38'S). A particular > feature of our region is that for summer crops, temperatures are lower than > those reported at the same latitude in the Norhern Hemisphere. I have > noticed that, for very early or very late seeding dates, when temperature is > low, the model gives important estimation biases in dry weight, yield and > its components. > Have you noticed this kind of problems somewhere else? > > Thanks in advance, > > Pablo Abbate > UI-Balcarce > Argentina. > > <------------------------------>
Date: Mon, 25 Mar 1996 10:45:36 +0100 From: Lianhai Wu .<.Lianhai.Wu@mv.slu.se.>. Subject: Re: CERES-Maize At 18:23 24/03/96 -0600, you wrote: I had the experience to run the CERES-Maize mdoel. Fortunately it was run in Continental climate, rather high in temperature. I remember, if my mind is right, that there is a file invloved in the model which stores a lot of parameter values for various speices. Maybe it could help you to change the values according to the species dominated in Argentina. Hopefully this suggestion can help you to fix the problem. Lianhai >Hi! I'm a researcher from Universidad Nacional de Mar del Plata, Argentina. >At present I'm working with CERES-Maize without water or nutrient >limitations, with data from Balcarce, Argentina (c. 38'S). A particular >feature of our region is that for summer crops, temperatures are lower than >those reported at the same latitude in the Norhern Hemisphere. I have >noticed that, for very early or very late seeding dates, when temperature is >low, the model gives important estimation biases in dry weight, yield and >its components. >Have you noticed this kind of problems somewhere else? > >Thanks in advance, > >Pablo Abbate >UI-Balcarce >Argentina. > > > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Dr. Lianhai Wu Soils Department SAC West Mains Road Edinburgh EH9 3JG Scotland, UK TEL: +44 131 535 4171 FAX: +44 131 667 2601 Email: ESA646@ED.SAC.AC.UK Lianhai.Wu@MV.SLU.SE Lianhai.Wu@ED.AC.UK ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ <------------------------------>
Date: Mon, 25 Mar 1996 08:40:16 -0500 From: John_P._Carbone@rohmhaas.com (John P. Carbone) Subject: Windows '95 or NT and DOS Based Models My group is contemplating a conversion to Windows '95 or NT (Novelle) operating environments. Comments regarding any compatibility problems with models like: PRZM3, EXAMS, GLEAMS, LEACHP, GENEEC, Spray Drift models and data bases such as SOILS5, Census of Agriculture, NRI Data Base, STATSGO and GIS software such as ArcView would be greatly appreciated. <------------------------------>
End of Digest ************************
Contents:
Re: CERES-Maize -Reply ("Pete Jamieson" .<.JamiesonP@crop.cri.nz.>.)
CERES-Maize -Reply ("Pete Jamieson" .<.JamiesonP@crop.cri.nz.>.)
<---------------------------------------------------------------------->
Date: Wed, 27 Mar 1996 09:06:00 +1300
From: "Pete Jamieson" .<.JamiesonP@crop.cri.nz.>.
Subject: Re: CERES-Maize -Reply
Passed on from a colleague, Derek Wilson
Pete Jamieson
I had similar problems using the potential yield maize model of Muchow,
Sinclair and Bennett (Agron. J. 82: 338-343 (1990)) in our cool climate at
43 S. Russ Muchow (CSIRO Division of Tropical Crops and Pastures,
Brisbane, Australia) and I modified the model to improve simulation in the
cool climate. Modifications included:
* changed phenology response to low temperature.
* reduced radiation use efficiency at low temperature.
* reduced rate of harvest index increase during grain fill at low
temperature.
* an increased time lag between silking and the start of grain growth at
low temperature.
* simulations were stopped when a frost (min air temperature <-1 C)
occurred.
The modified model gave good agreement between independent
datasets and simulated values of phenological events, grain biomass
and total biomass in our cool-temperate climate, without affecting the
model's performance in tropical and sub-tropical climates.
This work is reported in: Wilson, D.R., Muchow, R.C. and Murgatroyd,
C.J. Model analysis of temperature and solar radiation limitations to
maize potential productivity in a cool climate. Field Crops Res. 43: 1-18
(1995).
Derek Wilson
New Zealand Institute for Crop & Food Research
Private Bag 4704
Christchurch
New Zealand
email: wilsond@crop.cri.nz
Phone: 64-3-3256400
Fax: 64-3-3252074
On Sun, 24 Mar 1996 menegot@uni-mdp.edu.ar wrote:
> Hi! I'm a researcher from Universidad Nacional de Mar del Plata,
Argentina.
> At present I'm working with CERES-Maize without water or nutrient
> limitations, with data from Balcarce, Argentina (c. 38'S). A particular
> feature of our region is that for summer crops, temperatures are
lower than
> those reported at the same latitude in the Norhern Hemisphere. I have
> noticed that, for very early or very late seeding dates, when
temperature is
> low, the model gives important estimation biases in dry weight, yield
and
> its components.
> Have you noticed this kind of problems somewhere else?
>
> Thanks in advance,
>
> Pablo Abbate
> UI-Balcarce
> Argentina.
>
>
<------------------------------>
Date: Wed, 27 Mar 1996 09:20:00 +1300
From: "Pete Jamieson" .<.JamiesonP@crop.cri.nz.>.
Subject: CERES-Maize -Reply
Passed on from a colleague, Derek Wilson
Pete Jamieson
I had similar problems using the potential yield maize model of Muchow,
Sinclair and Bennett (Agron. J. 82: 338-343 (1990)) in our cool climate at
43 S. Russ Muchow (CSIRO Division of Tropical Crops and Pastures,
Brisbane, Australia) and I modified the model to improve simulation in the
cool climate. Modifications included:
* changed phenology response to low temperature.
* reduced radiation use efficiency at low temperature.
* reduced rate of harvest index increase during grain fill at low
temperature.
* an increased time lag between silking and the start of grain growth at
low temperature.
* simulations were stopped when a frost (min air temperature <-1 C)
occurred.
The modified model gave good agreement between independent
datasets and simulated values of phenological events, grain biomass
and total biomass in our cool-temperate climate, without affecting the
model's performance in tropical and sub-tropical climates.
This work is reported in: Wilson, D.R., Muchow, R.C. and Murgatroyd,
C.J. Model analysis of temperature and solar radiation limitations to
maize potential productivity in a cool climate. Field Crops Res. 43: 1-18
(1995).
Derek Wilson
New Zealand Institute for Crop & Food Research
Private Bag 4704
Christchurch
New Zealand
email: wilsond@crop.cri.nz
Phone: 64-3-3256400
Fax: 64-3-3252074
On Sun, 24 Mar 1996 menegot@uni-mdp.edu.ar wrote:
> Hi! I'm a researcher from Universidad Nacional de Mar del Plata,
Argentina.
> At present I'm working with CERES-Maize without water or nutrient
> limitations, with data from Balcarce, Argentina (c. 38'S). A particular
> feature of our region is that for summer crops, temperatures are
lower than
> those reported at the same latitude in the Norhern Hemisphere. I have
> noticed that, for very early or very late seeding dates, when
temperature is
> low, the model gives important estimation biases in dry weight, yield
and
> its components.
> Have you noticed this kind of problems somewhere else?
>
> Thanks in advance,
>
> Pablo Abbate
> UI-Balcarce
> Argentina.
>
>
<------------------------------>
End of Digest
************************
Contents: FYI, Virus (Daniel Fuka .<.dan@quetzalcoatl.com.>.) <---------------------------------------------------------------------->
Date: Wed, 27 Mar 1996 13:18:08 -0700 From: Daniel Fuka .<.dan@quetzalcoatl.com.>. Subject: FYI, Virus I thought that people would be interested in this posting that I recieved from Sandia National Labs. Ta's, dan ----- Begin Included Message ----- >From dgthoma@sandia.gov Mon Mar 25 10:23 MST 1996 Date: Mon, 25 Mar 1996 10:28:13 -0700 From: dgthoma@sandia.gov (Darrell G. Thomas) To: sys@sahp158.valinor.sandia.gov Subject: Info about a virus for everyone's information dgt > > Subject: Virus Alert > > > A new trojan horse virus has emerged on the internet with > the name PKZIP300.ZIP, so named as to give the impression > that this file is a new version of the PKZIP software used > to ZIP (compress) files. Do not download this file under > any circumstances! If you install or expand this file, the > virus will wipe your hard disk and affect modems at 14.4 and > higher. This is an extremely destructive virus and there > is not yet a way of cleaning up this one. > > > Repeat: Do not download any file with the name PKZIP300 > regardless of the extension. > > > ----- End Included Message ----- ----- End Included Message ----- ----- End Included Message ----- <------------------------------>
End of Digest ************************