This presentation will describe the data collected and developed for the CEAP National Cropland Assessment.
Three years of farm management data were collected for the individual farm fields associated with approximately 20,000 NRI sample points, including crop rotations, tillage and other field operations, fertilizer, manure, and pesticide applications, and use of conservation practices. Field operations and chemical application data include dates, amounts, types or formulations, and methods. Reported crop management also includes cover crops, straw harvest, inter-seeding, up to four vegetable crops within a single year, unique methods of reduced tillage, exotic crops, and use of professional services such as pesticide scouting, soil and tissue testing, irrigation water management, etc. Conservation practices were represented in the model input datasets through both changes in soil erosion equation factors and by the specification of within-field sub-basins representing, e.g., grassed waterways, buffer zones, and filter strips. For each NRI sample point soil attribute data, 42 years of daily weather event data, and average annual atmospheric nitrogen deposition were also compiled. The three-year reported snapshot of management data was treated as a repeated rotation over the 42-year period simulated. The database reflects the tremendous variety of cropping occurring across the U.S., including approximately 150 different crops grown in a variety of rotations and use of approximately 220 different pieces of farm equipment.