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Lai lai

Lai lai

Universiti Putra Malaysia, Malaysia

Title: The effect of rice straw biochar on nitrogen fertilizer management strategies to reduce green house gases emission in sustainable rice productivity

Biography

Biography: Lai lai

Abstract

In the next 25 years, rice productivity will need to increase 70% more to feed the growing human population. So extensive mineral fertilizer application will increase and directed to worsen greenhouse gases emission problem. Nitrous Oxide (N2O) emission by the main cause of agricultural increases isthe application of Nitrogen fertilizers. Besides, most of the world’s rice is grown in flooded conditions that favors to methane-producing bacteria. In agriculture, the use of mineral fertilizer should be assessed not only for the food but also for climate change mitigation. So these studies investigate the effect of rice straw biochar and nitrogen fertilizer management strategiesto mitigate climate change in sustainable rice production. The pot experiment was conducted in randomized complete block design with four replications. Treatments are rice straw biochar (9 ton/ha) was added with (150 kg N ha-1, 120 kg N ha-1, 90 kg N ha-1, 60 kg N ha-1, 30 kg N ha-1) for T1, T2, T3, T4, and T5 respectively and T6 (without biochar as a control) only 150 kg/ha N fertilizer (150 kg N ha-1, 98 kg P2O5, 96 kg K2O). Leaf area, plant height, tiller numbers, SPAD value, stomata conductance and gas sampling (CO2,CH4 and N2O) were carried out at every two weeks interval. Yield parameters and soil samples before sowing and after harvestingwere taken. Rice straw biochar through the different N fertilizer rates showed the synergetic effect on rice plant growth. The yield increasing over control was found 26.6%, 26.7% and26% in T2, T3, and T4, respectively.C:N, exchangeable cation (K, Ca and Mg) and micronutrients (Cu and Mn) were significantly higher in all biochar treated soils than control regardless of the amount of N fertilizer. Biochar treated soil had no significant difference over control for CO2 gas emission. Although there had no exact trend of reduction of gas emission, all biochar treated soil had significantly reduced methane and nitrous oxide gas emission. Rice straw should be recycled into biochar as fertilizer materials for enchancedgrowth, yield, improved soil fertility and reduced greenhouse gas. Specifically, application of nine ton/ha rice straw biochar through 60 kg N ha-1could be recommended for increasing yield, improving soil properties and reducing greenhouse gas in relative to control.