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- Research supported by the Science and Education Administration of the U. S. Department of Agriculture under Grant No. 5901–0410–8–0051–0 from the Cooperative Grants Research Office. Contribution from the Department of Agronomy, Mississippi State Univ., and the Mississippi Agric. and Forestry Exp. Stn. Approved by the Director as Technical Paper No. 5274.
- Research Associate and Associate Professor, respectively, Department of Agronomy, P. 0. Box 5248, Mississippi State, MS 39762.