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Date: | Fri, 5 May 2006 17:05:39 -0500 |
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Ali,
One clarification on my earlier reply - the soil water adjustment factor
is used to calculate potential NO3- and NH4+ uptake. The program
estimates potential uptake for each soil layer and then compares the
total potential N-uptake for all layers to predicted crop N-demand and
then goes back through each soil layer removing either the actual demand
or the potential uptake, whichever is less. The potential N-uptake that
I refer to is only an intermediate value and is not used by itself and
it is not used to predict potential (non-limited) growth - for that you
run the simulation with the water and nutrient balance options turned
off and the whole N-uptake routine is bypassed.
Stu
Ali Sadeghi wrote:
> I wonder if there is N uptake as a function of soil water content and/or soil texture. Most of the existing watershed models don't have that. I'm not familiar with the crop models?
>
> Any info is appreciated,
>
> Thanks
>
> Ali M. Sadeghi, Soil Physicist
> USDA-ARS, Hydrology & Remote Sensing Lab.
> Rm.102 Blg. 007, BARC-West
> 10300 Baltimore Ave.
> Beltsville, MD 20705
> Phone:(301) 504-6693
> Fax: (301) 504-5048
> Email: [log in to unmask]
>
>
>
--
The Ag Guy, LLC
Stuart Rymph, Ph.D., CCA - Wisconsin and Northeast Regions
6063 Beckman Rd.
Mazomanie, WI 53560
Phone (608) 469-8538
Phone/Fax (608) 795-0021
E-Mail: [log in to unmask]
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