Soil inorganic N processes

The following processes are computed on a daily basis in the soil inorganic N module:

  1. Plant uptake of NO3 and NH4 is done in the plant routines, but amounts of N taken up are integrated into state variables in the inorganic N module.
  2. Fertilizer event: Place fertilizer added today
  3. Tillage event: Mix soil NO3, NH4, and urea in tillage depth
  4. Volatilization of NH4 in oxidation layer to ammonia gas ( NH3 )
  5. Hydroloysis of urea to NH4
  6. Mineralization and immobilization due to organic matter decomposition
    1. Addition of mineralized N to NH4 pool
    2. Subtraction of immobilized N from NH4 (preference) and NO3 pools
  7. Nitrification of NH4 to NO3, N2O and NO gases
  8. Denitirification of NO3 to N2O and N2 gases
  9. Movement of NO3 and Urea with soil water drainage and upflux