Abstract

ABSTRACT Nitrous Oxide Emission from Rainfed Lowland Rice Soils through Applications of Rice Straw and Nitrification Inhibitor Materials. Alternate wet-dry of soil condition under rainfed lowland system influence on source and sink dynamics of green house gases. Lowland rice soil is one of antropogenic sources of nitrous oxide (N2O) emission produced by microbiological nitrification-denitrification mediated processes. Attempt to increase soil productivity in lowland rice system by organic amendment is predicted to stimulate nitrous oxide production. The increase of N2O production in lowland rice could be suppressed by using nitrification inhibitor materials. A field experiment was conducted in rainfed lowland rice during 2009 dry season. The objective was to study interaction of rice straw application and nitrification inhibitor materials on nitrous oxide emission from rainfed lowland rice. Experiment was arranged using factorial randomizes block design with three replicates and treatment of rice straw application (without rice straw, fresh straw, composting straw) and inhibitor nitrification materials (without inhibitor nitrification, neemcake, carbofuran). Interaction of rice straw and nitrification inhibitor materials decreased significantly N2O emission from lowland rice soil. Nitrous oxide emission in plot without rice straw was higher than in plot treated with neither fresh rice straw nor composting straw. Application neemcake combined with composting straw emitted lowest nitrous oxide with flux of 72 g N2O ha-1 season-1, whereas the highest N2O emission was found in plot without nitrification inhibitor materials and rice straw with flux of 454 g N2O ha-1 season-1. Compared with treatment of without nitrification inhibitor, application of neemcake and carbofuran could suppress nitrous oxide emission of 48.6 and 41.3 %, respectively. Key words : nitrous oxide emission, rainfed lowland, rice straw, nitrification inhibitors

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