Biomass Composting Combined With Dicyandiamide Lowered Greenhouse Gas Emissions And Grain Quality Of Winter Wheat

Straw compost replacement with chemical fertilizers along with dicyandiamide (DCD) can reduce greenhouse gas emissions and improved wheat yield and quality. The experiment was conducted to explore the impact on greenhouse gas emissions of biomass compost combined with DCD. In this research, the influence of combination of compost with nitrification inhibitor on dynamic change in the emission fluxes of nitrous oxide (N2O), carbon dioxide (CO2), methane (CH4) and yield & quality of wheat was investigated. Wheat was sown using ten treatments: CKN: 225 kg N, 75 kg P and 225 kg K ha(-1); CK0: 0 kg N, 0 kg P and 0 kg K ha(-1); T1D1: 180 kg N, 60 kg P, 180 kg K, 15 t biomass compost and 20 kg DCD ha(-1); T1D2: 180 kg N, 60 kg P, 180 kg K, 15 t biomass compost and 40 kg DCD ha(-1); T1D3: 180 kg N, 60 kg P, 180 kg K, 15 t biomass compost and 60 kg DCD ha(-1); T1D4: 180 kg N, 60 kg P, 180 kg K, 15 t biomass compost and 80 kg DCD ha(-1); T2D1: 202.5 kg N, 67.5 kg P, 202.5 kg K, 7.5 t biomass compost and 20 kg DCD ha(-1); T2D2: 202.5 kg N, 67.5 kg P, 202.5 kg K, 7.5 t biomass compost and 40 kg DCD ha(-1); T2D3: 202.5 kg N, 67.5 kg P, 202.5 kg K, 7.5 t biomass compost and 60 kg DCD ha(-1); T2D4: 202.5 kg N, 67.5 kg P, 202.5 kg K, 7.5 t biomass compost and 80 kg DCD ha(-1). Results showed that the total greenhouse gas emissions in T2D3 (202.5 kg N, 67.5 kg P, 202.5 kg K, 7.5 t biomass compost and 60 kg DCD ha(-1)) and T1D3 treatments (180 kg N, 60 kg P, 180 kg K, 15 t biomass compost and 60 kg DCD ha(-1)) treatments were reduced by 15.7 and 32.2% compared with the traditional application of nitrogen fertilizer. The grain protein content and amylopectin contents were increased in T1D3 (180 kg N, 60 kg P, 180 kg K, 15 t biomass compost and 60 kg DCD ha(-1)) by 8-14% compared with control. Moreover, the yield didn't have significant different compared with traditional fertilization. In conclusion, straw compost replacement with chemical fertilizers along with DCD can reduce greenhouse gas emissions. The use of 15 t ha(-1) straw compost + 60 kg ha(-1) DCD reduced chemical fertilizer demand by 20%. (C) 2020 Friends Science Publishers