Effect of Phosphate Rich Organic Manure (PROM) on growth, yield and quality of blackgram [Vigna mungo (L.) hepper]

A field investigation entitled “Effect of phosphate rich organic manure (PROM) on growth, yield and quality of blackgram” was conducted in kharif 2024 at Post Graduate Institute Farm, Mahatma Phule Krishi Vidyapeeth, Rahuri, Dist. Ahilyanagar (M.S.).The experiment consisted of seven treatments viz., T_1: Absolute control; T₂: Control (No P₂O₅); T₃: 100% P₂O₅ through SSP; T_4: 100% P₂O₅ through Phosphate Rich Organic Manure (PROM); T_5: 75% P₂O₅ through Phosphate Rich Organic Manure (PROM) + 25% P₂O₅ through SSP; T₆: 50% P₂O₅ through Phosphate Rich Organic Manure (PROM) + 50% P₂O₅ through SSP and T₇: 25% P₂O₅ through Phosphate Rich Organic Manure (PROM) + 75% P₂O₅ through SSP. Nitrogen was applied through Urea.The experiment was laid out in randomized block design (RBD) with three replications. The soil was clayey in texture, low in available nitrogen (195.35 kg ha^-1), medium in available phosphorus (17.03 kg ha^-1) and high in potassium (367.22 kg ha^-1). The soil was slightly alkaline in reaction (pH 8.18) with medium in organic carbon content (0.51%). The sowing was done manually by dibbling. The spacing was 30 cm x 10 cm.The results revealed that application of 100% P₂O₅ through SSP recorded significantly higher plant height (61.27 cm), number of functional leaves plant^-1 (12.63), leaf area plant^-1 (10.43 dm²), dry matter plant^-1 (32.10 g) and number of root nodules plant^-1 (29.92). However, it was at par with the application of 25% P₂O₅ through Phosphate Rich Organic Manure (PROM) + 75% P₂O₅ through SSP in case of plant height, number of functional leaves plant^-1, leaf area plant^-1, dry matter plant^-1 and number of root nodule plant^-1. Similarly significantly higher biological yield (seed + straw) and harvest index (3003 kg ha^-1 and 36.76% respectively) were obtained with application of 100% P₂O₅ through SSP which was at par with application of 25% P₂O₅ through Phosphate Rich Organic Manure (PROM) + 75% P₂O₅ through SSP.The significantly higher gross and net monetary returns (₹ 84545 and ₹ 35653 ha^-1) and numerically higher B:C ratio (1.73) was obtained with application of 100% P₂O₅ through SSP as compared to other treatments.