Nitrogen treatment by plants depends on the plants. The soil mineral nitrogen pools receive nitrogen by mineralisation of litter and humus, nitrification, fertilization and deposition and loose nitrogen by immobilization to litter, nitrification, leaching, denitrification and plant uptake. It is also influenced by vertical redistribution. All biological processes depend on soil water and temperature conditions. The soil is dividedinto layers from which plants are taking nitrogen in various rates.
Leaves take up carbon as Roots take up the nitrogen.
The leaf area captures the necessary radiation for the photosynthesis. The actual growth of the plants is the potential growth, which is proportional to the intercepted radiation, reduced by the different stresses. A full collection of tutorials is included in the help that comes with CoupModel. The later help file could also be downloaded as an Acrobat file suitable for printing. This file will substitute previous technical descriptions.