Moderation of green-house gas emission from rice-based cropping system to combat the effect of climate change

摘要

Rice agriculture interventions contribute towards the green-house gas (GHGs) emission responsible for global warming that put forward changes in climatic variables. Efforts should be made to reduce GHGs emission for restraining global warming. Keepingthis in view, a field experiment was carried out to evaluate the feasibility of different management practices for mitigating the green-house gases emission from rice-based cropping sequence in strip plpt design with two main plots (M, : Direct seeded rice with drum seeder followed by seed drilling greengram and M_2: Transplanted rice followed by broadcasted greengram) and five sub-plots (S_1 : 100% of recommended dose of fertilizer (RDF) through inorganic sources, S2: 75% of RDF through inorganic sources+25% N of RDF through organic sources, S3: 50% of RDF through inorganic sources+50% N of RDF through organic sources, S4: 25% of RDF through inorganic sources+75% N of RDF through organic sources and S_5: 100% of RDF through organic sources) with three replications at Kalyani, Nadia under New Alluvial Zone of West Bengal, India. After conducting two years of experiment (2011-12 and 2012-13), it was found that the DSR at kharif emitted lower CH_4 (1.137 mg/m~2/h), CO_2(1.0 mg/m~2/h) and N_20 (0.33 mg/m~2/h) at the maturity stage of rice. Furthermore, bow rice was lower emitter of these GHGs than that from kharif rice. Lowest emission of CH_4 and C0_2 with the values of 1.062 and 0.172 mg/m~2/h, respectively, from boro rice and 1.603 and 1.122 mg/m~2/hfrom kharif rice was observed under 100% RDF through inorganic fertilization, whereas N_20 emission was just reverse to emission of CH_4 and C0_2. Crop establishment through minimum soil disturbance along with 25% supplementation of inorganic fertilizerthough organics could be an option to lower down GHGs emission.