It is determined by the day-values of precipitation, min. and max. Besides that the most important dynamic processes are the ones concerning the water balance, transpiration, evaporation and drainage. They are the main processes for the transport of water and nutrients. Therefore the order of processes is drainage, evaporation, the nitrogen- and phosphorbalance, cropgrowth and fertilization. These processes are described by flows between the pools from a macroscopic point of view.
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The erosion productivity calculator. USDA, agricultural research service.