Influence of fertilizer management and water regime on methane emission from rice fields

Rath, Arun Kumar; Swain, Barsita; Ramakrishnan, B.; Panda, Darshan; Adhya, T. K.; Rao, V. R.; Sethunathan, N.

doi:10.1016/s0167-8809(99)00080-8

Cited by 84 publications

(40 citation statements)

References 26 publications

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“…The average CH 4 fluxes from wet-season and dry-season rainfed rice fields were 54 % and 16 %, respectively, that of continuously flooded fields, lower than the IPCC values of 80 % and 40 % for flood-prone rainfed and drought-prone rainfed rice fields, respectively (IPCC, 1997). Compared with the previous results (Yan et al, 2005a), the greater average CH 4 flux from wet-season rice fields was mainly attributed to the observed high fluxes from rainfed rice fields in Thailand and India (Kaewpradit et al, 2008;Kantachote et al, 2016;Rath et al, 1999). However, the CH 4 flux from deep water rice, only 6 % that of continuously flooded rice fields, remained less reliable due to the lack of sufficient observational data in the current analysis.…”

Section: Effects Of Controlling Variablescontrasting

confidence: 73%

Controlling variables and emission factors of methane from global rice fields

et al. 2018

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Abstract. Rice cultivation has long been known as one of the dominant anthropogenic contributors to methane (CH 4 ) emissions, yet there is still uncertainty when estimating its emissions at the global or regional scale. An increasing number of rice field measurements have been conducted globally, which allow us to reassess the major variables controlling CH 4 emissions and develop region-and countryspecific emission factors (EFs). The results of our statistical analysis show that the CH 4 flux from rice fields was closely related to organic amendments, the water regime during and before the rice-growing season, soil properties and agroecological conditions. The average CH 4 fluxes from fields with single and multiple drainage were 71 % and 55 % that of continuously flooded rice fields. The CH 4 flux from fields that were flooded in the previous season were 2.4 and 2.7 times that of fields previously drained for a short and long season, respectively. Rice straw applied at 6 t ha −1 in the preseason can decrease CH 4 emissions by half when compared to that applied shortly before rice transplanting. The global default EF was estimated to be 1.19 kg CH 4 ha −1 day −1 with a 95 % confidence interval of 0.80 to 1.76 kg CH 4 ha −1 day −1 for continuously flooded rice fields without organic amendment and with a preseason water status of short drainage. The lower EFs were found in countries from South Asia (0.85 kg CH 4 ha −1 day −1 ) and North America (0.65 kg CH 4 ha −1 day −1 ) relative to other regions, indicative of geographical variations at sub-regional and country levels. In conclusion, these findings can provide a sound basis for developing national inventories and mitigation strategies of CH 4 emission from rice fields.

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Section: Effects Of Controlling Variablescontrasting

confidence: 73%

Controlling variables and emission factors of methane from global rice fields

et al. 2018

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“…Paddy rice fields are flooded before sowing and the water level is generally held at 4-6 cm in shallow rice fields and as high as 10 cm in the fields with continuous flooding irrigation during the growing season (Rath et al 2000;Anastácio et al 2000). About 1,250 mm is supplied for rice culture during the growing season in Korea (Chae 1998).…”

Section: Paddy Rice Fieldsmentioning

confidence: 99%

Wise use of paddy rice fields to partially compensate for the loss of natural wetlands

Yoon

2009

Paddy Water Environ

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This paper reviews the scientific information related to climate change impacts on wetlands and functions of human-made wetlands such as paddy rice field and treatment wetland are described to partially compensate for the loss of natural wetlands. Wetlands are among the world's most productive environments and are cradles of biological diversity, providing the water and primary productivity upon which countless species of plants and animals depend for survival. Considerable evidence suggests that some global warming is occurring, which has important implications for wetland system as well as human life and wildlife.

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“…4). 분석결과 경유사용량을 10% 줄였을 때 약 2.5%의 (Mishra et al, 1997;Rath, 1999), 중간낙수기간에는 메탄 이 50%까지 감소된다는 연구 결과도 있다 (Kimura, 1992). …”

Section: Resultsunclassified

A Case Study to Estimate the Greenhouse-Gas Mitigation Potential on Conventional Rice Production System

Ryu¹,

Lee²,

Kim³

et al. 2013

Korean Journal of Soil Science and Fertilizer

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To estimate greenhouse gas (GHG) emission, we established inventory of conventional rice cultivation from farmers in Gunsan and Iksan, Jeonbuk province in 2011∼2012. This study was to calculate carbon footprint and to analyse the major factor of GHGs. We carried out a sensitivity analysis using the analyzed main factors of GHGs and estimated the mitigation potential of GHGs. Also we tried to suggest agricultural methods to reduce GHGs that farmers of this case study can apply. Carbon footprint of rice production unit of 1 kg was 2.21 kg CO 2 .-eq. kg -1 . Although amount of CO 2 emissions is largest among GHGs, methane had the highest contribution of carbon footprint on rice production system after methane was converted to carbon dioxide equivalent (CO 2 -eq.) multiplied by the global warming potential (GWP). Source of CO 2 in the cultivation of rice farming is incomplete combustion of fossil fuels used by agricultural machinery. Most of the CH 4 emitted during rice cultivation and major factor of CH 4 emission is flooded paddy field in anaerobic condition. Most of the N 2 O emitted from rice cultivation process and major sources of N 2 O emission is application of fertilizer such as compound fertilizer, urea, orgainc fertilizer, etc. As a result of sensitivity analysis due to the variation in energy consumption, diesel had the highest sensitivity among the energies inputs. If diesel consumption is reduced by 10%, it could be estimated that CO 2 potential reduction is about 2.5%. When application rate of compound fertilizer reduces by 10%, the potential reduction is calculated to be approximately 1% for CO 2 and approximately 1.8% for N 2 O. When drainage duration is decreased until 10 days, methane emissions is reduced by approximately 4.5%. That is to say drainage days, tillage, and reducing diesel consumption were the main sources having the largest effect of GHG reduction due to changing amount of inputs. Accordingly, proposed methods to decrease GHG emissions were no-tillage, midsummer drainage, etc.

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Influence of fertilizer management and water regime on methane emission from rice fields

Cited by 84 publications

References 26 publications

Controlling variables and emission factors of methane from global rice fields

Controlling variables and emission factors of methane from global rice fields

Wise use of paddy rice fields to partially compensate for the loss of natural wetlands

A Case Study to Estimate the Greenhouse-Gas Mitigation Potential on Conventional Rice Production System

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