Roland,
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
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.
> 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
> GERMANY
>
> http://www.gsf.de/iboe/expertn/Authors/stenger.html
> Phone (++49) 89 3187 2764
> FAX (++49) 89 3187 3376
> e-mail stenger@gsf.de
>