Effect of rhizobium, PSB and fertility levels on nutrient contents and their removal and yield of blackgram (Vigna mungo L.) Under custard apple (Annona squamosa L.) Based agri-horti system in Vindhyan region of Uttar Pradesh

An experiment was conducted at the Agricultural Research Farm of RGSC, Banaras Hindu University, Brakachha, Mirzapur during the rainy (kharif) season 2011. Results showed that application of 36 kg N, 70 kg P2O5 and 30 kg S/ha gave the maximum values of grain yield as well as removal of N, P and S over lower fertility levels. Seed inoculation of Rhizobium and phosphate solubilizing bacteria (PSB) was also found to increased yield. Removal of N, P, and S was significantly increased with combination of Rhizobium and PSB inoculants as compared with single inoculation of either Rhizobium or PSB and the control (No biofertilizers).