A field experiment was carried out at Krishi Vigyan Kendra, Katihar, Bihar in jurisdiction of Bihar Agricultural University Sabour, Bhagalpur during 2014 to 2018 with the objective to find out suitable crop residue management option under rice- wheat cropping system in Inceptisols of Seemanchal area of Bihar. The results after four years clearly indicates that the crop residue management practices involving  incorporation of residues improved favorably and significantly the soil properties such as bulk density, infiltration rate, mean weight diameter, aggregate stability, electrical conductivity, organic carbon, available nitrogen, phosphorus and potassium, bacterial and fungal population, enzyme dehydrogenase and phosphatase activity in the soil and increased the grain yields of rice and wheat crop in the system over removal or burning of crop residue practices. Due to increased availability of readily decomposable organic matter in the form of crop residue and freshly incorporated green manure, the microbial population increased dramatically when crop residues are incorporated in the soil which might be responsible for increased enzyme phosphatase and dehydrogenase activity, decrease in bulk density, increase in granulation and aggregation and thus infiltration rate. The incorporation of crop residues with or without green manuring found promising for the environmental friendly and effective utilization of the crop residues under prevailing rice wheat system in this area.

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The experiment was laid out in a split plot design with 3 levels of fertilizer as main plot and 4 levels of row spacing as sub plot with 3 replications. Results showed that the highest values of fingers plant -1 (9.9), finger length (16.3 cm), leaves plant -1 (11.5), leaf length (18.1 cm), leaf area index (1.36), grains finger -1 (519), biological yield (53.3 q ha -1 ), grain yield (6.4 q ha -1 ) and straw yield (46.9 q ha -1 ) were recorded under 125% of RDF. These parameters increased significantly with the increase in level of fertilizer from 75 to 100 and 100 to 125% of RDF. The plant height and harvest index were recorded significantly higher under 125% of RDF than 100% RDF but 100 and 75% of RDF was at par with each other. The tillers plant -1 and leaf width under 125% of RDF were significantly higher than 75% of RDF but at par with 100% RDF. The test weight under 125% of RDF was at par with 100% RDF and significantly higher than 75% RDF. The highest values of plant height (106.9cm), leaf area index (1.49), biological yield (68.3 q ha -1 ), grain yield (7.4 q ha -1 ) and straw yield (60.9 q ha -1 ) were recorded under 22.5 cm row spacing and these parameters increased significantly with narrowing the row spacing from 60 to 45, 45 to 30 and 30 to 22.5cm except plant height where 60 and 45cm spacing were at par. The highest values of tillers plant -1 (6.0), secondary tillers plant -1 (7.0), fingers plant -1 (11.2), finger length (15.9 cm), leaves plant -1 (11.4), leaf width (2.2 cm), leaf length (17.5 cm) and grains finger -1 (485) were recorded under 60 cm of row spacing and these parameters decreased significantly with narrowing the row spacing from 60 to 45, 45 to 30 and 30 to 22.5cm except secondary tillers where 22.5 and 30cm was at par, leaves plant -1 where 30 and 45 cm was at par and leaf width where 22.5 and 30cm and 45 and 60cm were at par. The leaf area index responded significantly to higher doses of fertilizer i.e. 100 and 125% of RDF at each level of row spacing. The leaf area index didn't respond to lower level of fertilizer i.e. 75% of RDF under wider row spacing i.e. 60 cm. Narrowing the row spacing from 45 to 30 or 22.5 cm, responded significantly to each and all the levels of fertilizer under study. K e y w o r d sBrown top millet, Row spacing, Fertilizer doses, Entisols

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