In Iowa, row crops planted in fields with slopes of greater than 18 percent will experience erosion rates greater than "T," regardless of soil type and type of tillage. Producers should consider removing row crops from these areas and establish permanent vegetation. This article discusses how to determine slope and ways to deal with sloping land in row cropping.
Iowa State University
Al-Kaisi, Mahdi; Hanna, H. Mark; and Tidman, Michael J., "Consider permanent vegetation for steeply sloping soils" (2001). Integrated Crop Management News. 1872.
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