Received for publication January 27, 1975. Part of a thesis presented by A. M. Ibrahim to the faculty of the Graduate College of the University of Nebraska in partial fulfillment of requirements for the Ph.D. Published as Paper No. 3924, Journal Series, NB. Agr. Exp. Sta. Research conducted under Project No. 20–3.
Former Graduate Student and Professor, Department of Horticulture.
Grants received from the Green Giant Foundation, Le Seuer, MN, and bean dealers in western NB, to support a substantial part of the research is appreciated.