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The objective of this work was to quantify the long-term runoff, percolation, erosion, and losses in nitrate-nitrogen, total phosphorus and pesticides attributed to multiple levels of corn stover [Zea mays L.) removal. A field-scale modeling framework, which utilized the Groundwater Loading Effects of Agricultural Management Systems/National Agricultural Pesticide Risk Analysis (GLEAMS-NAPRA) model and the Revised Universal Soil Loss Equation, Version 2 (RLJSLE2), was created and applied within Indiana to evaluate water quality impacts associated with three corn stover removal rates (38%, 52.5%, and 70%), based on proposed harvest efficiencies of three multipass field collection systems, with two tillage options...
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Millions of dollars have been spent on agricultural watershed projects across the nation, but little is known about the long-term impacts of watershed management and protection efforts. Information pertaining to long-term condition and water quality impact of best management practices (BMPs) is scarce. Evaluation methods that estimate the current condition of the practice based on visual inspection and comparison to selected original design dimensions were developed for grassed waterways, grade stabilization structures, field borders and parallel terraces. The evaluation tools were tested for validity using an expert panel approach and for reliability based on inter-rater correlation. The evaluation tool's three-point...
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