Use of conventional and conservation tillage systems and their effect on corn and soybean growth were investigated at the Southeastern Iowa Conservation Tillage Research Project. A southeastern Iowa farmer conducted field operations and made crop management decisions on 1.3-hectare (3-acre) field plots using his own materials and machinery. Research personnel measured crop growth and soil properties and monitored field operations. Results indicated that high amounts of rainfall may have negative impacts on no-till corn grown on the poorly drained soils in the study area. Soybean yields were not affected significantly by tillage method. Stratification of phosphorus and potassium in surface soil layers was observed in conservation tillage systems.
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Cruse et al. (1983) studied this question.