Purohit, H. S.Rathore, D. S.2017-05-222017-05-222008rathore and PUrohit, 2008http://krishikosh.egranth.ac.in/handle/1/5810012034Integrated Nutrient Management in Blackgram (Phaseolus mungo L.)A field experiment entitled “Integrated nutrient management in blackgram (Phaseolus mungo L.)” was conducted on clay loam soil having medium fertility (268.40, 19.50 and 370.80 kg, available N, P2O5 and K2O ha-1, respectively), EC 1.13 dSm-1 and pH 7.8 at Agronomy Farm, Rajasthan College of Agriculture, Udaipur during 2003-04 and 2004-05. The experiment consisted of 32 treatment combinations comprising of two levels of farm yard manure (0 and 5 t ha-1), four levels of phosphorus (0, 50, 75 and 100 % on the basis of STR) and four levels of biofertilizers (No inoculation, PSB, VAM and PSB + VAM). Experiment was conducted under split plot design having FYM and phosphorus in main plots and biofertilizers in sub plots with three replications and blackgram as a test crop. The residual effect of treatments were evaluated with wheat crop in sequence. Treatments were evaluated in terms of seed/grain, stover/straw and biological yields and uptake of nutrients (macro and micro) by blackgram and succeeding wheat. Post harvest soil properties were also determined after each crop to assess the change in physico-chemical properties and fertility status due to cropping and treatments under investigation. The results of the study showed that application of FYM @ 5 t ha-1 or application of 40 kg P2O5 ha-1 (100 % as based on STR) increased significantly the seed, stover and biological yield of blackgram as well as of succeeding wheat grown in sequence on residual FYM + P. Biofertilizers viz., PSB, VAM and PSB + VAM (dual inoculation) inoculation to blackgram significantly increased the seed, stover and biological yields of blackgram and yields of succeeding wheat grown in sequence. Application of FYM @ 5 t ha-1, P2O5 or biofertilizers significantly increased the number and weight of nodules per plant of blackgram. Application of FYM, phosphorus and biofertilizers significantly increased total uptake of macronutrients (N, P and K) and micronutrients (Zn, Cu, Mn and Fe) by blackgram and succeeding wheat. Combined use of phosphorus and FYM significantly increased the uptake of N, P and K by blackgram during both the years and uptake of N and P by succeeding wheat only on pooled basis and K during both the years and on pooled basis, while biofertilizers x FYM and biofertilizers x P significantly increased the total NPK uptake by blackgram and succeeding wheat. Combined use of biofertilizers x FYM significantly increased the total uptake of Zn, Cu, Mn and Fe by blackgram, P x FYM and biofertilizers increased significantly by blackgram and Zn, Mn and Fe uptake (P x FYM interaction) and Zn, Cu and Fe uptake (biofertilizers x P interaction) by succeeding wheat. Application of FYM significantly decreased bulk density and increased porosity, CEC, organic carbon content, significantly increased DTPA extractable cationic micronutrients, available NPK and S content of soil after the harvest of the blackgram and wheat crops. While, application of phosphorus significantly increased CEC and organic carbon, significantly decreased DTPA extractable Zn and Fe, and significantly improved N and P content of soil after the harvest of blackgram and succeeding wheat. Inoculation of biofertilizers significantly increased organic carbon content and available N and P of soil after the harvest of blackgram and available phosphorus content in the soil after the harvest of succeeding wheat. Combined use of 5 t FYM ha-1 + 20 kg P2O5 ha-1 resulted in supplementation of P equivalent to 20 kg P2O5 ha-1 for blackgram and of 10 kg P2O5 ha-1 equivalent for succeeding wheat. Dual inoculation of PSB + VAM also resulted in supplementation of P equivalent to 20 kg P2O5 ha-1 for blackgram. However, at higher fertility levels, dual inoculation resulted in supplementation of P equivalent to 10 kg P2O5 ha-1 only for blackgram. Integrated use of FYM and phosphorus or VAM + PSB and phosphorus not only supplemented the P requirement of main crop of blackgram equivalent to 20 kg P2O5 ha-1 but also of succeeding wheat to the extent of 10 kg P2O5 ha-1. Highest monetary returns of crop sequence (blackgram-wheat) was obtained with 5 t FYM + 40 kg P2O5 ha-1 (100 % P on STR basis) + dual inoculation of PSB + VAM followed by 30 kg P2O5 ha-1 (75 % P on STR basis) + 5 t FYM ha-1 with dual inoculation of PSB + VAM i.e. Rs. 99907.19 and Rs. 94890.16 ha-1, respectively with B : C ratio (6.18 and 5.90, respectively). Monetary return of same treatments without FYM were Rs 91180.69 and Rs 82439.37 ha-1, respectively with B : C ratio of 5.92 and 5.38.ennullThesis