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- The investigations reported in this paper (9–3–190) were in connection with a project of the KY Agric. Exp. Stn. and USDA‐ARS. This paper is published with the approval of the Director of the Station and was supported in part by grants from the Council for Burley Tobacco, Lexington, KY.
- Professors of Agronomy and former Graduate Research Assistant, University of Kentucky, Lexington, KY 40546–0091.