Effect of Phosphorus-Rich Organic Manure (PROM) and Phosphate Solubilizing Bacteria (PSB) on yield and quality of green gram

Abstract

Green gram (Vigna radiata L.) is a crucial crop globally, serving as a staple food for a vast population. Its productivity faces various challenges such as nutrient imbalance in India. To address this issue, a study was conducted during the Kharif season of 2024-2025 at the Instructional Farm, Post Graduate Institute, Mahatma Phule Krishi Vidyapeeth, Rahuri, with a view to study the “Response of green gram to phosphorus management through PROM and PSB”. The experiment was conducted in Split Plot Design with 3 replications. The study evaluated various levels of PROM application (50%, 75%, and 100% of recommended PROM) and different methods of liquid PSB inoculation. The results demonstrated a significant positive effect of integrated phosphorus management on nutrient assimilation by the green gram crop. Application of 100% P₂O₅ through PROM (M3) produced significantly higher green gram seed yield (1228 kg ha⁻¹) which was at par with M2 (75% P₂O₅ through PROM) (1194 kg ha-1). Among PSB treatments, the green gram seed treatment with liquid PSB @ 20-25 ml kg-1 seed + drenching with liquid PSB @ 5 lit ha at 30 DAS (S4) produced significantly higher seed yield (1136 kg ha-1) which was at par with S3 (1127 kg ha-1). The interaction between phosphorus levels and PSB was significant. The highest seed yield (1246 kg ha⁻¹) was recorded in M3S4 (100% P₂O₅ through PROM + seed treatment with liquid PSB @ 20-25 ml kg -1seed + drenching with liquid PSB @ 5 lit. ha-1 at 30 DAS). The M3 treatment (100% P₂O₅ through PROM) recorded highest protein content (22.19%) and protein yield (272.34 kg ha⁻¹) were recorded under the M3 treatment (100% P₂O₅ through PROM) which was at par with M2 (259.69 kg ha-1) Among PSB treatments, the S4 treatment (Seed treatment with liquid PSB + Drenching with liquid PSB @ 5 lit ha⁻¹ at 30 DAS) recorded the highest protein yield (247.71 kg ha⁻¹). The study concludes that applying 100% P2O5 through PROM is the most effective strategy for maximizing the uptake of major nutrients (N, P, K) in green gram, with PSB inoculation further enhancing P assimilation, thereby supporting increased overall crop productivity.