Effects of Green Manure Application and Prolonging Mid-Season Drainage on Greenhouse Gas Emission from Paddy Fields in Ehime, Southwestern Japan

Yo Toma, Nukhak Nufita Sari, Koh Akamatsu, Shingo Oomori, Osamu Nagata, Seiichi Nishimura, Benito H. Purwanto and Hideto Ueno
Additional contact information
Yo Toma: Graduate School of Agriculture, Ehime University, 3-5-7, Tarumi, Matsuyama 790-8566, Ehime, Japan
Nukhak Nufita Sari: Faculty of Agriculture, Universitas of Gadjah Mada, Bulaksumur, Yogyakarta 55281, Indonesia
Koh Akamatsu: Faculty of Agriculture, Ehime University, 3-5-7, Tarumi, Matsuyama 790-8566, Ehime, Japan
Shingo Oomori: Graduate School of Agriculture, Ehime University, 3-5-7, Tarumi, Matsuyama 790-8566, Ehime, Japan
Osamu Nagata: NARO Tohoku Agricultural Research Center, 4 Akahira, Shimokuriyagawa, Morioka 020-0198, Iwate, Japan
Seiichi Nishimura: NARO Hokkaido Agricultural Research Center, 1, Hitsujigaoka, Toyohira-ku, Sapporo 062-8555, Hokkaido, Japan
Benito H. Purwanto: Faculty of Agriculture, Universitas of Gadjah Mada, Bulaksumur, Yogyakarta 55281, Indonesia
Hideto Ueno: Graduate School of Agriculture, Ehime University, 3-5-7, Tarumi, Matsuyama 790-8566, Ehime, Japan

Agriculture, 2019, vol. 9, issue 2, 1-17

Abstract: Green manure application helps maintain soil fertility, reduce chemical fertilizer use, and carbon sequestration in the soil. Nevertheless, the application of organic matter in paddy fields induces CH 4 and N 2 O emissions. Prolonging mid-season drainage reduces CH 4 emissions in paddy fields. Therefore, the combined effects of green manure application and mid-season drainage prolongation on net greenhouse gas emission (NGHGE) were investigated. Four experimental treatments were set up over a 2-year period: conventional mid-season drainage with (CMG) and without (CM) green manure and prolonged (4 or 7 days) mid-season drainage with (PMG) and without (PM) green manure. Astragalus sinicus L. seeds were sown in autumn and incorporated before rice cultivation. No significant difference in annual CH 4 and N 2 O emissions, heterotrophic respiration, and NGHGE between treatments were observed, indicating that green manure application and mid-season drainage prolongation did not influence NGHGE. CH 4 flux decreased drastically in PM and PMG during mid-season drainage under the hot and dry weather conditions. However, increasing applied carbon increases NGHGE because of increased CH 4 and Rh. Consequently, combination practice of mid-season drainage prolongation and green manure utilization can be acceptable without changing NGHGE while maintaining grain yield in rice paddy fields under organically managed rice paddy fields.

Keywords: Oryza sativa; Astragalus sinicus; methane; nitrous oxide; heterotrophic respiration; net greenhouse gas emission; mid-season drainage; weed (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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