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This publication suggests tillage operation adjustments that may leave an additional 10 to 15 percent surface residue beyond what current practices leave with a chisel plow or disk system.
Iowa State University Extension and Outreach
Agricultural and Biosystems Engineering, Crops, Equipment and Machinery
Agricultural Education | Bioresource and Agricultural Engineering
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Hanna, H. Mark; Melvin, S. W.; and Pope, Richard O., "Conservation Tillage: Adjustment and operation of planters in systems with high levels of surface residue" (2008). Agriculture and Environment Extension Publications. 117.