Within field spatial variation in methane emissions from lowland rice in Myanmar

Oo, Aung Zaw; Win, Khin Thuzar; Bellingrath-Kimura, Sonoko Dorothea

doi:10.1186/s40064-015-0901-2

Cited by 23 publications

(14 citation statements)

References 48 publications

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“…In dry season rice, high emission peak at flowering stage was in line with other studies [24][25][26]. High emission peak during the middle and later growing period of dry season could probably be attributed to high soil organic matter turnover due to increased microbial activities under high soil temperature, the decomposition of plant residues from shed leaves and root turnover [26,27], and the higher availability of substrates in the rice rhizosphere [24]. Among the irrigation methods, on most days, high CH 4 emissions were observed from CF compared with the AWD irrigations, due to the low soil Eh (Figure S2a,b) under the continuously flooded condition in the CF treatment.…”

Section: Methane Emission In Relation To Different Awd Managementsupporting

confidence: 87%

Mitigation Potential and Yield-Scaled Global Warming Potential of Early-Season Drainage from a Rice Paddy in Tamil Nadu, India

Sudo

Inubushi

et al. 2018

Agronomy

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Water-intensive systems of rice cultivation are facing major challenges to increase rice grain yield under conditions of water scarcity while also reducing greenhouse gas (GHG) emissions. The adoption of effective irrigation strategies in the paddy rice system is one of the most promising options for mitigating GHG emissions while maintaining high crop yields. To evaluate the effect of different alternate wetting and drying (AWD) irrigation strategies on GHG emissions from paddy rice in dry and wet seasons, a field experiment was conducted at the Tamil Nadu Rice Research Institute (TRRI), Aduthurai, Tamil Nadu, India. Four irrigation treatments were included: One-AWD (one early drying period), Two-AWD (two early drying periods), Full-AWD (wetting and drying cycles throughout the rice season), and CF (continuous flooding). Different rice varieties were also tested in the experiment. In this study, we emphasized one factor (irrigation effect) that affects the dependent variable. The results show that early AWD treatments reduced methane (CH 4 ) emissions by 35.7 to 51.5% in dry season and 18.5 to 20.1% in wet season, while full-AWD practice reduced CH 4 emissions by 52.8 to 61.4% compared with CF. Full-AWD in dry season not only significantly reduced CH 4 emission during that season, it also resulted in the decline of the early season emission in the succeeding wet season. Global warming potential (GWP) and yield-scaled GWP were reduced by early or full season AWD in both rice seasons. The GWP value from nitrous oxide (N 2 O) was relatively low compared to that from CH 4 in both rice seasons. Rice yield was not affected by irrigation treatments although varietal differences in grain and straw yields were observed in both rice seasons. This study demonstrated that early season water managements are also effective in reducing CH 4 and total GHG emissions without affecting rice yield.

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Section: Methane Emission In Relation To Different Awd Managementsupporting

confidence: 87%

Mitigation Potential and Yield-Scaled Global Warming Potential of Early-Season Drainage from a Rice Paddy in Tamil Nadu, India

Sudo

Inubushi

et al. 2018

Agronomy

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“…This research included different fertilizing regimes as typically applied by farmers in Myanmar. Inorganic fertilizer rates were based on recommended rates according to the extension service from the Ministry of Agriculture, Livestock and Irrigation (MOALI) [36], inorganic fertilizer rate by farmer's practice [37,38] and cow manure application by Moe et al [39]. Our aims were (1) to quantify CO 2 fluxes under different water management practices and fertilizer application during common Myanmar's rice cultivar cultivation; and (2) to elucidate the combined effect of water management practices and fertilizer application on the biomass yield of rice.…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Water Management and Fertilizer Applications on CO2 Fluxes from a Selected Myanmar Rice (Oryza sativa L.) Cultivar

Min

Rulı́k

2020

IJPSS

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The application of nitrogen fertilizer and the water management practices are important to optimize potential yields in rice cultivation. Moreover, they may affect the emissions patterns of methane (CH4) and carbon dioxide (CO2) emission. Compared to methane, knowledge about the combined effects of different fertilizer rates together with different water management practices on CO2 fluxes are scarce. Therefore, this study aims to assess CO2 fluxes of a selected rice cultivar in response to different fertilizer applications and water management practices. The treatments included two different applications of inorganic fertilizer (recommended rate and farmer’s practice), organic manure application and water management practices; continuous flooding (CF) and alternate wetting and drying (AWD). Mean total CO2 flux in CF was -30.82 g CO2 m-2 d-1 during daytime and 29.64 g CO2 m-2 d-1 during nighttime. Surprisingly, the average net CO2 fluxes were negative under both CF (-49 mg CO2 m-2h-1) and AWD practices (-127 mg CO2 m-2h-1), indicating a net CO2 uptake by the rice plants. Inorganic fertilizer applications led to considerably higher net CO2 emissions compared to the control under both CF and AWD. Conversely, CO2 emission fluxes in the treatment with organic manure showed negative net CO2 fluxes under both water management practices and while revealing the same fresh biomass as observed in other treatments (inorganic fertilizer and control). Taken together, modifications of current cultivation systems toward using organic manure, that emit less CO2, could effectively mitigate CO2 impacts regardless of the selected water management practice.

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“…In the flooded rice fields, applied straw provides a C source for methanogenesis and develops strictly anaerobic soil conditions [25,26]. This changed soil condition stimulates CH 4 production, inhibits CH 4 oxidation, and then increases CH 4 emission [27,28]. Aerobic digestion of amended straw during off-cropping season significantly decreased CH 4 emission during rice cropping season.…”

Section: Discussionmentioning

confidence: 99%

Effect of straw incorporation on methane emission in rice paddy: conversion factor and smart straw management

et al. 2019

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Straw incorporation is strongly recommended in rice paddy to improve soil quality and mitigate atmospheric carbon dioxide (CO 2), via increasing soil organic carbon (SOC) stock. However, straw application significantly increased methane (CH 4) emission during rice cultivation, and then its incorporation area was not expanded effectively. To find the reasonable straw management practice which can reduce CH 4 emission without productivity damage, the effect of straw incorporation season and method on CH 4 emission was investigated at six different textured paddy fields in South Korea for 2 years. A straw was applied right after rice harvesting in autumn, and the other right before rice transplanting in spring. In the autumn application, straw was applied with two different methods: spreading over soil surface or mixing with soil. Straw application significantly increased seasonal CH 4 flux by average 28-122% over 197-590 kg CH 4 ha −1 of the no-straw, but its flux showed big difference among straw applications. Fresh straw application before transplanting increased seasonal CH 4 flux by approximately 120% over the no-straw, but the autumn application reduced its CH 4 flux by 24-43% over 509-1407 kg CH 4 ha −1 of the spring application. In particular, the seasonal CH 4 flux was approximately 24% lower in straw mixing with soil after autumn harvesting than 423-855 kg CH 4 ha −1 in straw spreading over surface. However, CH 4 fluxes were not significantly discriminated by soil and meteorological properties in the selected condition. Straw application slightly increased rice grain yield by approximately 4% over the no-straw, but rice productivity was not statistically different among straw applications. Spring straw application increased CH 4 intensity which means seasonal CH 4 flux per grain yield by the maximum 220% over the no-straw. Autumn straw application significantly decreased CH 4 intensity by average 24-65% over the spring straw application. In particular, CH 4 intensity in straw mixing with soil treatment was not statistically different with the no-straw. Therefore, autumn straw application with mixing inner soil could be a reasonable straw management practice to decrease CH 4 emission impact with improving soil productivity.

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Within field spatial variation in methane emissions from lowland rice in Myanmar

Cited by 23 publications

References 48 publications

Mitigation Potential and Yield-Scaled Global Warming Potential of Early-Season Drainage from a Rice Paddy in Tamil Nadu, India

Mitigation Potential and Yield-Scaled Global Warming Potential of Early-Season Drainage from a Rice Paddy in Tamil Nadu, India

Effects of Different Water Management and Fertilizer Applications on CO2 Fluxes from a Selected Myanmar Rice (Oryza sativa L.) Cultivar

Effect of straw incorporation on methane emission in rice paddy: conversion factor and smart straw management

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