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The use of reduced tillage practices in the U.S. has expanded a great deal over the past 15 years (USDA, 1986) . In 1985, roughly a quarter of South Dakota's corn acreage was reported to be under reduced tillage (S25medra and Delvo, 1986) . A 1985 survey by South Dakota State University (SDSU) showed 69% of the farmer respondents to be using some type of reduced tillage on at least part of their acreage (Allen, 1987).
Primary motivations for farmers adopting reduced tillage practices are to reduce machine costs, conserve moisture, and control soil erosion losses. Problems of weed control are usually accentuated under reduced tillage. Greater expenditures for chemical weed control are almost inevitable with reduced tillage. Some studies show interconnections between reduced tillage and fertilizer nutrient requirements.


Economics Research Report 88-3