Cropping Systems on the Delmarva Peninsula to Reduce Ground Water Contamination

by W. F. Ritter, (M.ASCE),
R. W. Scarborough,



Document Type: Proceeding Paper

Part of: North American Water and Environment Congress & Destructive Water

Abstract:

A total of twelve cropping systems were simulated with the GLEAMS model for nitrate leaching. A precipitation model was developed using a Markov chain model and a gamma distribution for the nitrate leaching simulations. The GLEAMS model was calibrated from field data collected in an irrigated corn and nitrogen experiment in the 1980s. The model simulations indicated that nitrate leaching losses for a sorghum-soybean-sorghum rotation were the lowest of the twelve cropping systems. Nitrate leaching losses for conventional tillage corn were slightly higher than for no-till corn and fertigation did not reduce nitrate leaching losses compared to nitrogen side-dressing.

Subject Headings: Nitrates | Leaching | Simulation models | Groundwater pollution | Water pollution | Crops | Nutrient pollution

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