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Effect of Gypsum Application on Reducing Methane (CH4) Emission in a Reclaimed Coastal Paddy Soil
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 Title & Authors
Effect of Gypsum Application on Reducing Methane (CH4) Emission in a Reclaimed Coastal Paddy Soil
Lim, Chang-Hyun; Kim, Sang-Yoon; Kim, Pil-Joo;
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BACKGROUND: Gypsum() is known as an ideal amendment to improve soil quality of the reclaimed coastal land. Since gypsum has very high concentration of electron acceptor like , its application might be effective on reducing emission during rice cultivation, but its effect has not been studied well. METHODS AND RESULTS: The effect of gypsum on emission and rice growth characteristics was studied by pot test, which was packed by reclaimed paddy soils collected from Galsa, Hadong, Gyeongnam province. Chemical-grade gypsum was applied in two soils having EC 2.25 and 9.48 dS/m at rates of 0, 0.5, 1.0 and 2.0%(wt/wt). emission was characterized a week interval by closed chamber method during rice cultivation. emission rate was significantly decreased with increasing salt accumulation and gypsum application levels. With increasing gypsum application, dissolved concentration in the leachate water was significantly increased, which might have suppressed production in soil. Total flux was dramatically decreased with increasing gypsum application. In contrast, rice yield was increased with increasing gypsum application and then achieved maximum productivity at 1.0% gypsum application in two soils. CONCLUSION(s): Gypsum is a very good soil amendment to suppress emission in reclaimed coastal paddy soils, and improve rice productivity and soil properties. The optimum application level of gypsum is assumed at ca. 1% to improve soil productivity with reducing effectively emission during rice cultivation.
Calcium sulfate; emission;Gypsum;Reclaimed soil;
 Cited by
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