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Effect of Nitrate and Sediment Constraints on Economically Optimal Crop Production¹

ABSTRACT

Crop systems and practices which are economically optimal in a 485.6-ha (1,200-acre) watershed with a planned recreational reservoir were determined under conditions of varying constraints on water quality in the reservoir. The technique of linear programming was used. Two requirements related to sedimentation and three requirements related to NO₃^–-N concentration in the leachate below the root zone were considered. Thus, six combinations of restrictions on the choice of optimal crop systems were imposed. A system of charges for all sediment introduced into the reservoir substantially reduced erosion, irrespective of the limit placed on NO₃^–-N concentration in the leachate below the root zone. Relaxation of the NO₃^–-N limit from 10 mg/liter to no limit approximately doubled the net income above nonland costs.

Key Words: conservation tillage • nitrogen application rate • linear programming • watershed planning

¹ Contribution from Illinois Agr. Exp. Sta., University of Illinois, Urbana. Supported in part by a matching grant from Office of Water Resources Research, U. S. Department of Interior, Agreement No. 14-31-0001-3272.

² Research Assistant and Professor, respectively, Dep. of Agricultural Economics, University of Illinois, Urbana-Champaign 61801.

Received for publication July 20, 1973.