Field experiments were conducted in summer and kharif 1974 under irrigation to study the effect of time and quantity of N application on dry mattor accumula- tion in Sorghum (CSH. 5). Sampling was done from 20th day of sowing until maturity (100 days) at an interval of 10 days from specially roserved sample rows. Plants were dried and dry matter estimated. Application of entire quantity of N basally, especially at higher doses (over 150 kg/ha) caused an initial set back on the growth of the plant. Foliar application of N in the early stages increased the dry matter production. The dry matter accumulation was slower in kharif than in summer mainly due to moderate temperature prevailing in that season. In summer, the rate of dry matter production was rapid and reached peak in the grand growth period (40-50 days) but in kharif the dry matter accumulation was steady and spread out for the entire cropping period.
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