Re: N Simulation (fwd)

---------- Forwarded message ----------
Date: Tue, 29 Apr 1997 09:41:12 -0700 (PDT)
From: Tom Hodges <thodges@tricity.wsu.edu>
To: "Tom Hodges (moderated newsgroup)" <sustag@BETA.TRICITY.WSU.EDU>
Cc: Stenger Roland <stenger@gsf.de>
Subject: Re: N Simulation (fwd)

I work with potato -- water and nitrogen relations.  This summer I
hope to collect data to validate the Simpotato model irrigation and
nitrogen scheduling functions.  There will be field plots with
Russet-burbank potato at 3 levels of available nitrogen, 200, 325,
and 450 kg N/ha with a yield goal of about 90 MT/ha of fresh tubers
(20 MT/ha dry weight yield).  I expect that the 325 kg N level will
be near optimal although it is 100-200 kg lower than most commercial
growers use.  One can apply lower levels of N if there is little
or no excess water applied and hence little N lost by leaching.
There will also be several passive capillary boxes to measure
water and N drainage down below 1 meter depth.

We grow potato on coarse sand in a desert climate (20 mm rain, all
in the winter months) and latitude 45 degrees.

Information about Simpotato is available on my web page.

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
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If this represents anything, it is only my opinion.

> Date: Wed, 23 Apr 97 9:56:36 MEZ
> From: Stenger Roland <stenger@gsf.de>
> To: sustag@beta.tricity.wsu.edu
> Subject: N Simulation
> Dear all,
> I would like to know about projects where process-oriented simulation of the 
> nitrogen dynamics in arable soils is used (tested ?) as a means to establish 
> sustainable N management practises?
> I'm especially keen to get notice of studies 
> a) on the farm/landscape section level
> b) with diverse crop rotations (cereals, potatoes, corn, sunflowers, lupines, 
> clover, cover crops....)
> c) with different management types (organic <-> conventional)
> Greetings from Munich, 
> Roland
> Dr. Roland Stenger
> Institute of Soil Ecology
> GSF-Research Center for 
> Environment and Health
> P.O. Box 1129
> D-85758 Oberschleissheim
> http://www.gsf.de/iboe/expertn/Authors/stenger.html
> Phone	(++49) 89 3187 2764
> FAX	(++49) 89 3187 3376
> e-mail	stenger@gsf.de