Received for publication November 15, 1973. Contribution No. 537, Department of Horticulture and Forestry, Contribution No. 1382, Department of Agronomy, Agricultural Research Service, USDA, in cooperation with the Kansas Agricultural Experiment Station, and Contribution No. 1236, Division of Biology, Kansas State University, Manhattan.
Vegetable Research Horticulturist, Former Horticulture Graduate Student, Soil Scientist, USDA, ARS, NCR, and Biologist, respectively.
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