The EPIC (Environmental Policy Integrated Climate) model is a cropping systems model developed to assess the impact of soil erosion on productivity and simulate approximately eighty crops with unique parameters. Researchers can select and edit weather stations, soils, and fertilizers to match specific conditions, as well as simulate various farming practices, including irrigation and fertilization. However, its application is limited to small scales, and it does not account for photosynthesis or cover all regions.

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2.  Environmental Policy Integrated Climate (EPIC) model
 It is a cropping systems model that was developed to estimate
soil productivity as affected by erosion as part of the Soil and
Water Resources Conservation Act analysis for 1980, which
revealed a significant need for improving technology for
evaluating the impacts of soil erosion on soil productivity.
 EPIC simulates approximately eighty crops with one crop
growth model using unique parameter values for each crop

3.  By clicking weather in epic on the Data/Setup
screen, the researcher may select or edit weather
stations for use in WinEPIC.
 To select/deselect specific weather stations to be
used, click “Select Weather Stations for…" and select
weather stations (or deselect certain unnecessary
weather stations) from the list provided.

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11. • By first selecting a specific county, the
researcher may then select/deselect soils to be
used or edit the selected soils for that county.
• To select/deselect specific soils to be used,
click “Select Soils for…" and select/deselect all
or only specific soils from the list provided.

12. • To modify any of the specific soils parameters in a soil series, click “Edit Selected Soils for…”,
choose a soil to edit and make the desired changes

13. • By choosing a soil to edit, a screen similar to above Figure will appear. The
researcher must first select a soil layer to edit by clicking one of the layer labels;
the default parameters for the selected soil layer appear in the "Current" column.
• The researcher may now edit the soil data in the "New" column. Entering data in
the "New" column causes Save Layer to appear to save the new data. Defaults is
used to cancel changes made and revert back to default database values.
• Also note, that there is additional information provided for some of the soil
parameters in a large box on the screen.

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15. Also we can edit the water table variables

17. • FERTILIZERS on the Data/Setup screen is used to edit or select fertilizers for use in Win
EPIC.
• To select/deselect specific fertilizer products to be used, click “Select Fertilizers for…"
and select fertilizers (or deselect certain unnecessary fertilizer products) from the list
provided.
• To modify any of the specific fertilizer products, click “Edit Selected Fertilizers”, choose
specific fertilizer to edit from the drop down menu and make the desired changes.
• The researcher can modify any prices of the existing fertilizers.
• Fertilizer price data listed under the "Current" column may be changed by entry of new
data under the "New"column.
• Cancel and Save appear when a change is entered in the "New" column.
• Note: The gray fields may not be altered.

26. Caution: DO NOT set the amount of fertilizer rate applied to zero.

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45.  It simulates crop production under different farming practices.
 Operations including fertilization and irrigation application rates and
timing are also simulated.
 It considers nutrient losses to the environment N leaching and
runoff.
 The model has been applied for irrigation scheduling assessment and
biofuels production.
 Mitigation of agricultural drought risk.

46.  The default value of the model parameter is unique for each crop.
 Application of the EPIC model estimated plant growth and related
processes (such as crop yield and crop water productivity) is limited
to a small scale.
 EPIC model does not simulate photosynthesis.
 GEPIC is not available for all regions.