It was designed for advisory purposes, e.g. fertilizer recommendation. The extended version can be used in combination with geographic information systems for site specific simulations in medium scaled regions. Water movement is described by means of a cascade model, based onfield capacity of different layers. Mineralization of nitrogen follows 1st order kinetics, based on pools with slow and fast decomposable organic matter. Nitrogen pools regard mineral and organic fertilizers as well as residues.
Nitrate transport is calculated with diffusion convection equation.
Dry matter production is based on solar irradiation and leaf area index of the canopy. Model package includes basic tools for presentation, print out, data base editing. Suitable extensions are dBase, CoPlot. Ph. D. Thesis, University Hannover, 149p. References Kersebaum, K.C., 1989.