A field experiment was conducted to investigate the effect of phosphorus and boron on yield and yield attributes of black gram. Four levels of phosphorus (0, 25, 50, 75 kg ha-1) and four levels of boron (0, 0.5, 1.0, 1.5 kg ha-1) were laid in split plot design with three replications. . The native soil had a pH 4.99, E.C. 0.42 dS m-1, organic carbon 1.32%, available nitrogen 251.35 kg ha-1, available phosphorus 13.68 kg ha-1, available potassium 233.24 kg ha-1 and hot water soluble boron 0.054 ppm. The results revealed that application of phosphorus and boron have a synergistic effect on yield, content and uptake in seed and straw of black gram. Significant highest seed yield was found when 50 kg P2O5 ha-1 along with 1.5 kg B ha-1. Significant plant height at 30 DAS (20.04 cm) and 60 DAS (39.31 cm) was found with the application of P50B1.5 whereas at maturity, the plant height was recorded maximum (43.01 cm) at P50B0.5. Whereas, highest number of pods per plant was recorded with combination of 75 kg P2O5 ha-1 and 1 kg B ha-1 (19.89) and lowest was recorded in control (11.93) where no phosphorus and boron has been applied. The highest seed index was obtained with combination of as 50 kg P2O5 ha-1 and 0.5 kg B ha-1 as 4.64 whereas, lowest as 2.54 in control respectively.
Keywords: Phosphorus, boron, acid soil, yield and yield attributes.