Mohd Noor bin IsmailLouisiana State University, Baton Rouge
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Received for publication November 27, 1974.
Associate Professor, Department of Horticulture, Louisiana State University, Baton Rouge.
Director, Farm Operations, University of Agriculture, Malaysia, Sungei Besi, Malaysia.
The preliminary work for this study was done during 1967–69 when the senior author was at the University of Agriculture, Malaysia, under a joint Louisiana State University—Ford Foundation project. During 1971–1973 the junior author was at Louisiana State University under a study grant from the University of Agriculture, Malaysia. The support from these organizations is gratefully acknowledged.