The Environmental Policy Integrated Climate (EPIC) model is a cropping systems model that was developed to estimate soil productivity as affected by erosion. It predicts effects of management decisions on soil, water, nutrient and pesticide movements, and their combined impact on soil loss, water quality, and crop yields for areas with homogeneous soils and management.
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Release Notes
Under certain conditions, a bug in NAJN subroutine was generating negative values for the soil NH3 content. The bug was eliminated by modifying the initial IF statement to consider the possibility of crop nutrient demand equal zero. The source code has been modified as follows:
Original version: IF(X2<1..AND.DMD>0.)THEN
Modified version: IF(X2<1.0.OR.DMD==0.0)THEN
The format of the DHS output file has been slightly modified by adding an extra space between variables. Modifications done in BSIM, format 682 for the variables and 731 for the header