Received for publication March 31, 1981. Reseach supported by the Oyo State of Nigeria Government, by the National Science Foundation on Grant DAR-7912261, and by the College of Agricultural and Life Sciences, University of Wisconsin, Madison. This investigation is a portion of a thesis presented in partial fulfillment of the requirements for the PhD degree.
Present address: Institute of Agriculture, Research and Training, P.M.B. 5029, Ibadan, Nigeria.
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