IntroductionOver the past 10 years, concern has risen about farm production adversely affecting the Nation’s water quality. Considerable Federal and State resources have been committed to reducing agricultural sources of water pollution, such as sediment and nutrients in runoff and leaching chemical residuals. Agricultural sources now form the largest single contributor to the Nation’s surface water quality problem, and there is evidencethat some ground water supplies may be vulnerable to leaching chemicals in agricultural areas (Crutchfield,Hansen, and Ribaudo, 1993).
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