Natural Resources Conservation Service

United States Department of Agriculture

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Cropland Modeling Documentation

NRI-CEAP Cropland Survey Design and Statistical Documentation (PDF; 0.5 MB)
Transforming Survey Data to APEX Model Input Files
- Text (PDF; 0.4 MB)
- Tables (PDF; 0.2 MB)
APEX Model Upgrades, Data Inputs, and Parameter Settings for Use in CEAP Cropland Modeling (PDF; 0.7 MB)
Modeling Structural Conservation Practices (PDF; 0.2 MB)
Assumptions and Procedures for Simulating the Natural Vegetation Background Scenario for the CEAP National Cropland Assessment (PDF; 0.5 MB)
APEX Model Validation for CEAP (PDF; 0.6 MB)
I_APEX Calibration and Validation Using Research Plots in Tifton, Georgia (PDF; 0.1 MB)
The Agricultural Policy Environmental EXtender (APEX) Model: An Emerging Tool for Landscape and Watershed Environmental Analyses (Transactions of the ASABE published paper, July 2010) (PDF; 4.4 MB)
The Agricultural Policy Environmental EXtender (APEX) Model: An Emerging Tool for Landscape and Watershed Environmental Analyses (technical report, April 2009) (PDF; 2.6 MB)
The Soil and Water Assessment Tool: Historical Development, Applications, and Future Research Directions (PDF; 3.6 MB)
Historical Development and Applications of the EPIC and APEX Models
The HUMUS/SWAT National Water Quality Modeling System and Databases (PDF; 11.6 MB)
Calibration and Validation of CEAP-HUMUS (PDF; 4.9 MB)
Documentation of Nitrogen and Phosphorus Loadings From Wildlife Populations (PDF; 0.1 MB)
Integrating APEX Output for Cultivated Cropland with SWAT Simulation for Regional Modeling (PDF;1.0 MB)
Documentation on Delivery Ratio used for CEAP Crop Modeling for Various River Basins in the United States (PDF; 3.6 MB)
Pesticide Risk Indicators Used in CEAP Cropland Modeling (PDF; 0.5 MB)
Manure Loadings Used to Simulate Pastureland and Hay Land in CEAP HUMUS/SWAT Modeling (PDF; 0.5 MB)
Adjustment of CEAP Cropland Survey Nutrient Application Rates for APEX Modeling - Forthcoming (PDF; 0.1 MB)
Integrated Pest Management (IPM) Indicator Used in CEAP Cropland Modeling - Forthcoming (PDF; 0.1 MB)

Selected APEX Related Publications and Presentations by Modeling Team

The APEX Model (PDF; 0.4 MB)
APEX Calibration/Validation of Water Runoff and Percolation and Herbicide Losses for a Loamy-Sand Coastal Plain Soil (PDF; 0.3 MB)
Test of APEX for Nine Forested Watersheds in East Texas (PDF; 0.3 MB)
APEX Feedlot Water Quality Simulation (PDF; 0.1 MB)
Application of APEX For Forestry (PDF; 0.8 MB)
Evaluation of EPIC for Assessing Crop Yield, Runoff, Sediment And Nutrient Losses From Watersheds With Poultry Litter Fertilization (PDF; 0.2 MB)
Reducing Atrazine Losses: Water Quality Implications of Alternative Runoff Control Practices (PDF; 0.5 MB)
Predicting Soil Erosion for Alternative Land Uses (PDF; 0.4 MB)
Development of a continuous soil moisture accounting procedure for curve number methodology and its behavior with different evapotranspiration methods (PDF; 0.3 MB)
Sensitivity Analysis of APEX for National Assessment (PDF; 0.5 MB)
Sensitivity and Uncertainty Analyses of Crop Yields and Soil Organic Carbon Simulated with EPIC (PDF; 0.6 MB)
Modeling the impacts of soil management practices on runoff, sediment yield, maize productivity, and soil organic carbon using APEX (PDF; 1.1 MB)
Impacts of the Sustainable Forestry Initiative Landscape Level Measures on Hydrological Processes (PDF; 0.6 MB)
APEX workshop PowerPoint presentation (PDF; 2.9 MB)
Simulating CEAP Sample Points with the APEX Model (PowerPoint presentation) (PDF; 0.3 MB)
Methods for Simulating Conservation Practices and Estimating Effects for the CEAP National Assessment (PDF; 0.2 MB)

Selected HUMUS Related Publications and Presentations by Modeling Team

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