growth of specific crops, soil water, soil N, erosion) communicate with each other only by messages passed via a central ‘engine’. This concept is implemented using a program structure in which all modules (e.g. While this achieves a sound logical structure for improved simulation of soil management and long-term change in the soil resource, it does so without loss of sensitivity in simulating crop yields. A key innovation is change from a core concept of a crop responding to resource supplies to that of a soil responding to weather, management and crops. APSIM (Agricultural Production Systems Simulator) is a software system which allows (a) models of crop and pasture production, residue decomposition, soil water and nutrient flow, and erosion to be readily re-configured to simulate various production systems and (b) soil and crop management to be dynamically simulated using conditional rules.
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