Received for publication April 17, 1974. Contribution from Dept. of Agronomy, Wisconsin Agr. Exp. Sta., Madison, WI 53706. Research supported by the College of Agricultural and Life Sciences, University of Wisconsin, Madison.
Graduate student and Assoc. Prof. Agron., respectively.
The authors acknowledge with appreciation the assistance of R. R. Smith in certain phases of the statistical analysis.
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