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Title:Economic evaluation of the effect of selected crop practices on nonagricultural uses of water
Author(s):Onishi, H.; Narayanan, A.S.; Takayama, T.; Swanson, E.R.
Subject(s):Water resource development
Water resource development--Illinois
Water quality
Nitrate contamination
Crop practices
Economic analysis
Linear programming
Farm income
Geographic Coverage:Illinois (state)
Abstract:Cropping systems may have an unfavorable influence on the quality of nearby surface water. In this study, linear programming methods were used to assess the impact of improvements in certain water quality characteristics on economically optimal crop systems. Thus, the effect of crop practices on water quality is analyzed indirectly by assuming that farmers would alter their cropping practices in the most economical way in order to conform to various water-quality constraints. A 1,200-acre watershed was used to illustrate the procedure. Sediment entering the reservoir was treated as a variable constraint on maximization of farm income. Requiring successively lower amounts of sediment to enter the reservoir caused farm income to decrease at an increasing rate. The analysis was enlarged to include a constraint on nitrate in the leachate below the root zone. This phase of the analysis also included a charge for removing at least some of the sediment entering the reservoir. As the nitrate limit on the leachate was lowered, farm income decreased at an increasing rate. The requirement of removal of the sediment by itself had little or no effect on the nitrate concentration in the leachate. Extensions of the procedure for use in other situations are suggested.
Issue Date:1974
Publisher:University of Illinois at Urbana-Champaign. Water Resources Center
Genre:Report (Grant or Annual)
Sponsor:U.S. Geological Survey
U.S. Department of the Interior
Rights Information:Copyright 1974 held by the authors
Date Available in IDEALS:2016-04-18

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