Methane And Nitrous Oxide Emission From Irrigated Rice – Under Different Management Practices and Soil Organic Carbon Strata

Abstract:

A field experiment was started in 2017-18 and 2018-19 at Modipuram under irrigated conditions to assess the quantum of greenhouse gases emission from rice-wheat system under different organic strata (medium and high) under different crop establishment methods (puddled transplanted rice and direct seeded rice; wheat under zero tillage and conventional tillage) and different sources of nitrogen [control, neem coated urea, vermicompost and application of 3,4-dimethylpyrazole phosphate/dicyandiamide (DMPP/DCD nitrification inhibitor)]. Methane and nitrous oxide emissions under high and medium organic carbon strata were different in both direct seeded and transplanted rice. GWP reduced in direct seeded rice by 13.9 per cent compared to transplanted rice under high carbon soil strata, while it reduced by 4.6 per cent under medium carbon soil strata. The application of DCDA nitrification inhibitor reduced the GWP in direct seeded rice by 15.2 per cent compared to transplanted rice under high carbon soil strata, while it reduced by 10.8 per cent under medium carbon soil strata. CH4 emission reduced in direct seeded rice compared to transplanted rice by 18.5 and 6.7 per cent under high carbon and medium carbon soil strata, respectively. This showed the soil organic strata is having influence on emissions in irrigated rice.