The field experiment was conducted the year 2014-2015 on the old long-term fertilizer experiment started since 1983 to assess the longterm effect of integrated nutrient management on soil organic carbon fractions in vertisol under sorghum wheat cropping system. The study showed that there was slight decrease in soil bulk density and calcium carbonate increase in porosity and water holding capacity and slightly increase pH and EC of soil over 33 years of sorghum-wheat cropping system receiving organic manures in combination with inorganic fertilizer. And it was observed that various forms of carbon and fractions of humus tended to decrease with depth and use of organics like subabul and FYM in conjunction with NPK fertilizers exerted a remarkable impact on the distribution and built up of various carbon and humus fractions in soil.

Field experiment was conducted during kharif season of 2018 at Research farm, Department of Soil Science and Agricultural Chemistry, Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani to assess the response of spinach crop to various zinc solubilizers and graded levels of zinc on changes in zinc and other soil nutrients. Experiment consists of sixteen treatment in which four zinc solubilizers (Pseudomonas striata, Bacillus megaterium, Trichoderma viride and Control) and four graded levels of ZnSO4 (0 kg ZnSO4 ha -1 ,10 kg ZnSO4 ha -1 , 20 kg ZnSO4 ha -1 and 30 kg ZnSO4 ha -1 ) were used in factorial randomized block design. Seed treatment of spinach was done with zinc solubilizing microbial cultures and application of zinc in graded doses at the time of sowing with recommended dose of fertilizers. Significantly highest values of available N, P2O5, K2O and S were noted in treatment receiving Psuedomonas striata + 30 kg ZnSO4 ha -1 interaction. DTPA Zn, Fe, Mn and Cu were noted maximum in treatment receiving Psuedomonas striata + 30 kg ZnSO4 ha -1 .

Field experiment was conducted during kharif season of 2018 at Research farm, Department of Soil Science and Agricultural Chemistry, Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani to assess the response of spinach crop to various zinc solubilizers and graded levels of zinc on quality parameter and chemical properties of soil. Experiment consists of sixteen treatments in which four zinc solubilizers (Pseudomonas striata, Bacillus megaterium, Trichoderma viride and Control) and four graded levels of ZnSO4 (0 kg ZnSO4 ha -1 , 10 kg ZnSO4 ha -1 , 20 kg ZnSO4 ha -1 and 30 kg ZnSO4 ha -1 ) were used in factorial randomized block design. Seed treatment of spinach was done with zinc solubilizing microbial cultures and application of zinc in graded doses at the time of sowing with recommended dose of fertilizers. The quality attributes improved significantly with inoculation of Psuedomonas striata + 30 kg ZnSO4 ha -1 . The pH, EC, organic carbon and calcium carbonate after harvest of spinach indicates nonsignificant interactive results.