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Accepted for publication November 6, 1961.
Synopsis: Sorghum residues on the soil surface were preserved at 30 to 45% of original material in a summer fallow system with maximum use of subsurface tillage. Climatic weathering and tillage burial were nearly equally responsible for residue reduction.
2 Soil Scientists, Western Soil and Water Management Branch, SWCRD, ARS, USDA, Central Plains Field Station, Akron, Colorado.
Received for publication May 13, 1961. Accepted for publication November 6, 1961.
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