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SEASONAL PATTERN OF NODAL AND DIURNAL REPRODUCTIVE ABSCISSION IN THREE SOYBEAN CULTIVARS

M.HATAM, M. AKMALAND G.H.JAMRO

Abstract: The nodal and diurnal abscission patterns in two determinate (Lee, MG Vi and Essex MgV) and one indeterminate (Williams MG III) cultivars of soybean (Glycine max (L) Merrill) were examined. Lee, Essex and Williams aborted 15.4, 6.7 and 3.2 flowers and 4.8, 1.8 and 1.6 pods per node, respectively. Total flower and pod abortion was 57.9 and 38.1% in Lee, 59 and 31.8% in Essex and 42.8 and 36.7% in Williams, respectively. Flower and pod abortion in the lower two-third canopy accounted for 77 and 83.4% in Lee, 83.8 and 61% in Essex and 88 and 84.6% in Williams, respectively. The period of blooming, pod setting and pod filling differed for different cultivars and even within the same cultivar. In Lee and Essex maximum reproductive abscission occurred during the first two-third of the period and in Williams during the middle.

NWFP Agricultral University, Peshawar, Pakistan.