Interactive effect of biochar, fym and nitrogen on soil properties and yield of blackgram grown in vertisol

The experiment was conducted during Kharif- 2018-19 to study the interactive effect of biochar, FYM and nitrogen on soil properties and yield of blackgram” at Department of Agronomy, Dr. PDKV, Akola. The experiment was laid out in Randomized Block Design (RBD) with nine treatments and three replications. The treatments comprised of control, various levels of N, FYM and biochar and their combinations. On the basis of results obtained in the present investigation, highest seed yield (788 kg ha-1) and straw yield (994 kg ha-1) of black gram were recorded with soil application of biochar @ 10 t ha-1 + FYM @ 10 t ha-1 and nitrogen @ 20 kg ha-1 and it was on par with treatment of biochar 5 t ha-1 + FYM 5 t ha-1 + Nitrogen 20 kg ha-1, and biochar 10 t ha-1 + FYM 10 t ha-1 + Nitrogen 10 kg ha-1. The organic carbon, available N (231.5 kgha-1), P (22.19 kgha-1) and K (348.2 kg ha-1) were significantly increased with the application of biochar @ 10 t ha-1 + FYM @ 10 t ha-1 and nitrogen @ 20 kg ha-1 and it was on par with treatment of biochar 10 t ha-1 + FYM 10 t ha-1 + Nitrogen 10 kg ha-1 and biochar 5 t ha-1 + FYM 5 t ha-1 + Nitrogen 20 kg ha-1. The bulk density (1.44 Mg m-3) and WHC (47.33%) was non- significant. The soil microbial biomass carbon (SMBC) (204 mg kg-1) was increased significantly with the application biochar @ 10 t ha-1 + FYM @ 10 t ha-1 and nitrogen @ 20 kg ha-1 and it was found to be on par with the treatments of biochar 10 t ha-1 + FYM 10 t ha-1 + Nitrogen 10 kg ha-1and biochar 5 t ha-1 + FYM 5 t ha-1 + Nitrogen 20 kg ha-1. The positive and significant relationship of yield was observed with available P (0.839**), available N (0.785**), organic carbon (0.735**) and available K (0.713**) indicating their contribution in improving yield of blackgram.