A field experiment entitled “Integrated Nutrient Management in Blackgram under Rainfed Condition” was conducted at the Agriculture Farm, Bhagwant University, and Ajmer during kharif season of 2015 on the loamy sand soil. The experiment was laid out in a factorial randomized block design with twenty treatments replicated thrice. Treatment consisted of organic manure viz., FYM @ 3.0 t ha-1, FYM @ 6.0 t ha-1, vermicompost @ 1.5 t ha-1, vermicompost @ 3.0 t ha-1 and RDF (25:50 N:P2O5 kg ha-1) (F1, F2, F3, F4 and F5 respectively) as first factor and seed inoculation of biofertilizer viz., no seed inoculation, Rhizobium, PSB and Rhizobium + PSB (R0, R1, R2 and R3 respectively) as second factor. The gross and net plot size were 4.5 x 4.0 m2 and 3.9 x 3.8 m2 respectively. The Blackgram was shown on July 2th, 2015. Experimental results revealed that growth characters viz., plant height, number of branches, dry matter leaf area, leaf area index plant-1, AGR, RGR, yield contributing characters viz., number of pods plant-1, test weight, grain yield, straw yield, biological yield were significantly more with treatment recommended dose of fertilizer (25: 50 N:P2O5 kg ha-1).The next best treatments were F2 (FYM @ 6.0 t ha-1) and F4 (Vermicompost @ 3.0 t ha-1) . Similarly, treatment F5 (RDF) recorded significantly higher GMR, NMR and B: C ratio over rest of treatments and significantly lowest NMR and B: C ratio was observed in treatment Vermicompost @ 3.0 t ha-1. The uptake of NPK was recorded significantly higher in treatment RDF over rest of treatments. The available nitrogen, phosphorus, and potassium were recorded significantly higher in treatment F2 (FYM @ 6.0 t ha-1) over rest of the treatments. Seed inoculation of biofertilizer enhanced the growth attributes viz., plant height, number of branches, dry matter, leaf area, leaf area index plant-1, AGR, RGR, yield contributing characters viz., number of pods plant-1, test weight, grain yield, straw yield and biological yield were significantly more with treatment R3 (Rhizobium+PSB) than no seed inoculation. Similarly, these treatments also registered significantly higher values of gross monetary returns, net monetary returns and B:C ratio. The uptake of NPK and available nitrogen, phosphorus and potassium per hectare were significantly higher in treatment receiving Rhizobium + PSB seed inoculation over rest of treatments.
