Response of blackgram (Phaseolus mungo) to fertilization and rhizobium inoculation

A field experiment was conducted during the rainy season of 1991 and 1992 to study the influence of fertilizers, manures and rhizobium inoculation of seeds on seed yield of blackgram (Phaseolus mungo L.) and N, P and K uptake by blackgram. Changes in available N, P and K in soil were also recorded under these treatments. Application of 25 kg N/ha (as urea) + 50 kg P/ha (as single superphosphate as enriched farmyard manum (FYM) in 750 kg/ha + 6.25 tonnes/ha FYM as basal and diammonium phosphate spray 25 kg/ha twice at flower initiation and 15 days after FC to the crop sown with rhhizobium inoculated seeds was found optimum and recorded 75.0 and 54.5% more seed yield than the control in the first and second crops respectively. Resides, the protein content of the seeds increased by 14.5 and 15.4% over the control. For N, P and K uptake by seeds and available N, P and K in the soil also increased significantly by the above combination of treatment over the absolute control treatment.