Methane Emission from Direct Seeded Rice under The Influences of Rice Straw and Nitrification Inhibitor

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Methane Emission from Direct Seeded Rice under The Influences of Rice Straw and Nitrification Inhibitor


A. Wihardjaka (1), S. Djalal Tandjung (2), B. Hendro Sunarminto (2), dan Eko Sugiharto (2)

(1) Balai Penelitian Lingkungan Pertanian

(2) Universitas Gadjah Mada Yogyakarta



Abstract

Rice straw incorporation into soil and application of nitrification inhibitor increase not only rice production but also emission of methane (CH4). Methane is one of greenhouse gases (GHGs) that causes global warming. Incorporation rice straw into soil could improve soil productivity and increase inorganic fertilizer efficiency, however its management is predicted to contribute to methane emission. A Field experiment was conducted under rainfed lowland rice system to determine the effect of rice straw and certain nitrification inhibitors on methane emission from direct seeded rice cropping. A factorial randomized block design was used with three replicates. The first factor is rice straw application (without rice straw, 5 t ha-1 fresh straw, 5 t ha-1 composted straw), and the second factor is nitrification inhibitor (without  nitrification inhibitor, 20 kg ha-1 neemcake, 20 kg ha-1 nematicide with carbofuran active ingredient). Rice straw applied in composted form decreased significantly methane emission compared to the fresh form. Methane emission from applying Fresh straw and composted straw was 93.5±4.0 and 73.2±6.6 kg CH4 ha-1 season-1, respectively. The applications of neemcake and carbofuran reduced average methane emission of 20.7 and 15.4 kg CH4 ha-1 season-1, respectively. Under direct seeded rice system, methane flux level correlated with plant biomass as shown by linier regression of Y = 0.0015X + 0.0575 (R2 = 0.2305, n = 27). Beside as a pest control and nitrification inhibitor, neem plant has a better prospect to decrease methane emission from direct seeded rice cropping. Under direct seeded systems, rice plant growth variables that correlated positively with methane flux were plant height and plant biomass, implying a higher methane emission under better plant growth.

Keywords : rice straw, nitrification inhibitor, methane emission, direct seeded rice


Sumber : Indonesian Journal of Agricultural Science Vol. 13 No. 1 p.1-11 (2012)



BALAI PENELITIAN LINGKUNGAN PERTANIAN

Indonesian Agricultural Environment Research Institute (IAERI)

 


A. Wihardjaka (1) and L.J. Wade (2)
(1)Research Station of Agricultural Environment Preservation

(2)International Rice Research Institute