This study was conducted to evaluate the performance of black gram (Vigna mungo.L) grown under drought stress using coir waste manure and cow dung manure. Two varieties of black gram-ATD mash 3 and ATD mash 1 were the treatment variables. A best fit positive relationship existed between leaf chlorophyll and leaf nitrogen content with two organic manures. N, P and K accumulation in the two varieties was affected significantly. However there was increasing tendency of N, P and K levels using coir waste manure. This is due to water holding capacity and drought resistance activity of coir waste. Among the two varieties ATD mash 3 showed better performances than ATD mash 1.

Keywords : Nitrogen level, Black gram, Chlorophyll, Plant samples, P analysis.