Received for publication January 14, 1976. Journal paper no. 6172 of the Purdue University Agricultural Experiment Station.
Foreign Area Fellow sponsored by the Foreign Area Fellowship Program, 605 Third Avenue, New York; currently Training Officer and Crop Management Specialist, The Asian Vegetable Research and Development Center, P.O. Box 42, Shanhua, Tainan, 741, Taiwan, Republic of China. I gratefully acknowledge the cooperation of Dr. Aquira Mizbuti, Prof. Joaquim Joel V. Rodrigues, Mr. Jose Rosado and all other staff at the Federal University of Vicosa (UFV), Vicosa, M. G., Brazil, and the many private companies that cooperated with the research and training program at UFV.