Prakash, S.SNIRANJAN, B. N.2023-01-042023-01-042022-06-09https://krishikosh.egranth.ac.in/handle/1/5810191123The effect of nitrogen management practices using different organic manures along with inorganic N levels on soil N forms, growth and yield of maize and subsequent greengram crop were studied in the laboratory condition and field during 2019-20 and 2020-21. The field experiment was laid out in Randomized Complete Block Design with ten treatments replicated thrice. Incubation study revealed that the content of NH4+-N and NO3--N (24.83 and 37.87 mg kg-1, respectively) was higher in the treatment receiving 75% RDN + 50% RD FYM + 25% RDN through vermicompost in 60 DAI and hydrolysable NH4+-N, hexosamine nitrogen, amino acid nitrogen, unidentified hydrolysable-N, total hydrolysable-N, non hydrolysable-N and total nitrogen was found significantly higher in treatment T7 (50% RDN + 25% RD FYM + 50% RDN through vermicompost) than T1 and T2 treatments. The field experiment revealed that significantly higher plant height (207.03 cm), number of leaves (14.63), kernel yield (84.88 q ha-1), stover yield (90.00 q ha-1), nutrient content and uptake by maize crop were significantly higher in treatment T6 (75% RDN + 50% RD FYM + 25% RDN through vermicompost). The pooled analysis of post harvest soils of maize and greengram recorded significantly higher available major and secondary nutrients in T7 treatment. The nitrogen fractions viz, NO3--N and NH4+-N content of 13.68 mg kg-1 and 22.11 mg kg-1, respectively was recorded in treatment T6 and organic fractions were found significantly higher in treatment (T7). The higher greengram seed yield (8.80 q ha-1) and nutrients uptake was recorded due to residual effect of the same treatment (T6). Economic analysis revealed that higher total net returns (Rs. 1,47,267) was recorded in T6 treatment receiving 75% RDN + 50% RD FYM + 25% RDN through vermicompost in maize and greengram crop.EnglishThesis