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- The investigation reported in this paper (No. 88.3.9) is in connection with a project of the Kentucky Agricultural Experiment Station and is published with the approval of the Director. The study was supported in part by USDA Contract 12–14–7001–1040.
- Professor of Agronomy, and Plant Physiologist (USDA‐ARS) and Adjunct Associate Professor, respectively, Dept. of Agronomy, University of Kentucky, Lexington, KY. 40546–0091.