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Iron-Reducing and Sulphate-Reducing Bacterial Populations’ Dynamics and Activities in Rice Paddy Soil under Subsurface Drainage
논문 기본 정보
- 저자정보
- 발행연도
- 2014.6
- 수록면
- 233 - 233 (1page)
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Iron-Reducing and Sulphate-Reducing Bacterial Populations’ Dynamics and Activities in Rice Paddy Soil under Subsurface Drainage
초록·키워드
Iron and sulphides toxicities are of the mains edaphic constraints that hamper rice production in West African savanna and forest lowlands. Many inland valley swamps and lowlands (rainfed lowlands, irrigated lowlands, mangrove swamps) have soil and water conditions that promote iron and sulphides toxicities in rice. Although chemical reduction processes of various types of pedogenic iron and sulphides oxides could not be underestimated, the bulk of these processes can be ascribed to the specific activity of Iron-Reducing Bacteria (IRB) and Sulphate-reducing Bacteria (SRB). The reducing conditions of waterlogged lowland soils boost iron and sulphides toxicities through the reduction of almost all iron into ferrous form (Fe2+) and sulphate reduction into sulfides. Thus, ferrous iron and sulfides productions in rice fields at high level cause rice injury.
Aiming to contribute at the improvement of rice yield in Africa, this study was developed to evaluate the impact of subsurface drainage on IRB and SRB dynamics and activities during rice cultivation.
Twelve concrete microplots field with a sandy-loam soil and a rice variety sensitive to iron and sulphides toxicities (FKR19) were used for the experiment. Soil in microplots was drained each 7 days (P1), 14 days (P2), and 21 days (P3), respectively. Control microplots (T) without drainage were prepared similarly. Same fer ... 전체 초록 보기
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