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]
>
>
>

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