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Received for publication June 30, 1981. Trade and company names are given for information only, and do not infer endorsement or preference by the U.S. Dept. of Agriculture over others which may be available.
Research Chemist, Agriculture Products Technology Research, and Soil Scientist and Biological Technician, Remote Sensing Research, respectively. We thank Marvin Heilman, Soil Scientist and Ned Lynn, Agricultural Research Technician and Farm Manager, Resource Conservation and Production Systems Research, for their efforts and assistance in field operations, and Dorene Emanuel, Physical Science Aide, Agricultural Products Technology Research, for carrying out most of the routine analyses.
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