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Synopsis: A mulch of crop residue as compared to a like amount of residue plowed into the soil significantly retarded plant growth. This retardation occurred independently of N fertility, soil moisture, and soil compaction. However, interactions between residue placement and the other variables was sometimes observed.
2 Soil scientists, USDA, Ames, Iowa. The second author is also Professor of Soils, Agronomy Department, Iowa State University.
Received for publication August 2, 1961.
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