1Received for publication June 12, 1969. Published with the approval of the Director, Colo. Agr. Expt. Sta., Ft. Collins, as Scientific Series No. 1418. Supported in part by Kenneth Post Foundation.
2Assoc. Professor, Department of Horticulture.
3Appreciation is expressed for Forest Nelson’s aid in the statistical analysis and for the comments by R. S. Vickers, Cleon Ross and R. W. Ward.
1018 Duke Street
Alexandria, VA 22314
© 2018-2023 American Society for Horticultural Science
Character limit 500/500