4.3 Article

Date of Planting, Spacing and Integrated Nutrient Management Practices Improves Soil Microbial Populations and Soil Fertility Status Under Rice -Arhar Cropping System in Acidic Soils of Eastern India

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TAYLOR & FRANCIS INC
DOI: 10.1080/00103624.2022.2146133

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Date of planting; FYM; green manuring; soil; spacing; STBFR

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Appropriate nutrient management and crop diversification through incorporation of pulse into rice based cropping system can achieve sustainable productivity. This study found that earlier planting, soil-test-based fertilizer recommendation + farmyard manure in rice, and 30 cm row spacing in arhar resulted in higher soil physico-chemical properties and microbial activities. The combination of organic and inorganic sources of nutrients showed higher positive nitrogen and potassium balance in the rice-arhar cropping system.
Rice (Oryza sativa L.) is a nutrient-exhausting crop, sustainable productivity of rice based cropping system can be achieved through appropriate nutrient management and crop diversification through incorporation of pulse into this system. Considering the above facts, a field experiment on rice-arhar system was conducted for two consecutive years (2018 and 2019) during kharif seasons at the Agronomy research Farm of Odisha University of Agriculture and Technology, Bhubaneswar having sub-humid climate with two date of planting, three nutrient management and three row spacing. Soil physico-chemical properties like N, soil organic carbon (SOC) was found higher with earlier planting, soil-test-based fertilizer Recommendation (STBFR) + Farmyard Manure (FYM) in rice and 30 cm row spacing in arhar. The system nutrient uptake of 219.76 kg N ha(-1), 38.25 kg P ha(-1) and 197.29 kg K ha(-1) and microbial activities in terms of dehydrogenase activity (DHA) (241.9 mg TPF g(-1) soil 24 hr(-1)), alkaline phosphatase activity (APA) (376.7 mg p-nitrophenol kg(-1) soil 1 h(-1)), microbial biomass Carbon (MBC) (260.3 mu g g(-1) of dry soil), microbial biomass nitrogen (MBN) (93.7 mu g N g(-1) soil) was registered with earlier planting, STBFR + FYM in rice and 30 cm row spacing in arhar. Higher positive N and K balance over initial (actual balance) in rice-arhar cropping system was observed in the treatment fertilized with both organic and inorganic sources of nutrients.

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