Vol. 10, Issue 11 (2021)

The result showed that chemical properties of soil like pH, EC and calcium carbonate were affected non-significantly but organic carbon showed significant results. The significantly highest organic carbon (7.5 g kg ^-1) was recorded with treatment T₇ (RDF+ 30 kg S ha^-1 + Rhizobium + PSB + Thiobacillus) followed by T₆ (RDF+ 20 kg S ha^-1 + Rhizobium + PSB + Thiobacillus) and the lowest organic carbon (6.1g kg^-1) was recorded with treatment T₁ (RDF). Soil pH, EC, calcium carbonate of soil after harvest was decreased as compare to initial value but the organic carbon content was increased in soil samples collected after harvest of blackgram than the initial soil samples.

Available nutrients viz; N, P, S, Fe and Zn were affected significantly due to application of different levels of sulphur and bio-fertilizers, however available K, Mn and Cu were affected non significantly. The treatment T₇ (RDF+ 30 kg S ha^-1 + Rhizobium + PSB + Thiobacillus) was recorded significantly maximum available N (243.53 kg ha ^-1), P (27.20 kg ha ^-1), S (25.10 kg ha ^-1), Fe (5.76 mg kg ^-1₎ and Zn (0.68 mg kg ^-1) than the other treatments followed by treatment T₆ (RDF+ 20 kg S ha^-1 + Rhizobium + PSB + Thiobacillus). The available N, P, K, S, Fe, Mn, Zn and Cu content in soil after harvest of blackgram was increased than the initial soil sample.