Welch, L. F.
(1979)
Nitrogen use and behavior in crop production.
Other.
University of Illinois, Urbana-Champaign.
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Abstract
All plants require large amounts of nitrogen for normal growth. Yet very few soils contain enough native nitrogen to sustain high yields in most crops; legumes are an exception. Agriculturalists have known for many years that the yields of non legumes usually increase when nitrogen from legumes and animal wastes is added to the natural levels stored in soil organic matter..
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