### Nitrogen simulation

Posted:

**Fri Jul 05, 2019 2:18 pm**We know Hydrus is not a crop-based model, however, it has interesting possibilities for solute transport modelling for my work. So to simulate

150kg N/ha applied in the sowing day is it true to assume all that in the first 5 top cm of the soil profile as the initial condition. Assuming the depth of fertilizer application is 5cm so

(150 kgN/ha) * (1/0.05m) =0.3 mgN/cm3 soil --------------[Initial concetration in total concentration : mass solute/volume of soil]

then we put this initial condition in the first 5 cm and model the nitrogen transport and run under the climatic conditions and for any year of planting, we put this condition and zero nitrogen in top boundary condition. is it true?

Considering whole nitrogen is nitrate, so Kd is ZERO and all passive uptake.

I attached one simple model

150kg N/ha applied in the sowing day is it true to assume all that in the first 5 top cm of the soil profile as the initial condition. Assuming the depth of fertilizer application is 5cm so

(150 kgN/ha) * (1/0.05m) =0.3 mgN/cm3 soil --------------[Initial concetration in total concentration : mass solute/volume of soil]

then we put this initial condition in the first 5 cm and model the nitrogen transport and run under the climatic conditions and for any year of planting, we put this condition and zero nitrogen in top boundary condition. is it true?

Considering whole nitrogen is nitrate, so Kd is ZERO and all passive uptake.

I attached one simple model