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- The Erosion-Productivity Impact Calculator (EPIC) (Williams et al., 1984) model
was developed to assess the effect of soil erosion on soil productivity. It was
used for that purpose as part of the 1985 RCA (1977 Soil and Water Resources
Conservation Act) analysis. Since the RCA application, the model has been
expanded and refined to allow simulation of many processes ... important in
agricultural management (Sharpley and Williams, 1990).
EPIC is a continuous simulation model that can be used to determine the effect
of management strategies on agricultural production and soil and water
resources. The drainage area considered by EPIC is generally a field-sized
area, up to 100 ha (weather, soils, and management systems are assumed to be
homogeneous). The major components in EPIC are weather simulation, hydrology,
erosion-sedimentation, nutrient cycling, pesticide fate, plant growth, soil
temperature, tillage, economics, and plant environment control.
Summary provided by: EPIC
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