A field experiment, with six genotypes of forage sorghum namely, M.P. Chari, HD-2, PC-23, S-2887-1, S-3225-1 and S-3197-1 was conducted to find out relationship between water soluble sugar and yield components. Sugar concentration varied from 8.2-25.3 per cent in leaf, collar, flower/cob and stem at pre-anthesis stage. Sharp decline in sugar concentration in stem at post-anthesis stage indicated its rapid utilization in cob development. This pattern was comparatively more pronounced in HD-2 and S-3225-1 which had comparatively larger leaf area and short distance between flag leaf to cob. Genotype S-3197-1 showed high fodder value because of high stem sugar content at post-anthesis stage. It was concluded that rapid decline of sugar concentration in stem at post-anthesis stage, and short distance between flag leaf and cob, exhibit potential determinants of seed yield in sorghum.
