An experiment was conducted to investigate effects of organic manure (coir waste and cow dung) with an anabaena azollae strain ML-2 on two black gram varieties (ADT-3 & ADT-5). The experiment was arranged in a randomized complete block design of a spilt plot fashion in three replications with the varieties of black gram on the main plots while the organic manure and a control (non-treatment) plot constituted the subplots. The organic manure application showed high yield of black gram. There was significant difference in the number of nodules among the black gram varieties. ADT-5 variety recorded the highest mean number of nodules (15.4) which was significantly different from the other varieties. It is recommended that ADT-5 should be used for cultivation of black gram using coir waste when compared with cow dung manure.
Black gram, root nodule, Anabena azollae, nitrogen, organic manure
