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Microbial biomass and organic matter turnover in wetland rice soils |
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| Authors: | J. L. Gaunt H. -U. Neue K. G. Cassman D. C. Olk J. R. M. Arah C. Witt J. C. G. Ottow I. F. Grant |
| Affiliation: | (1) Natural Resources Institute, Central Avenue, ME4 4TB Chatham Maritime, Kent, UK;(2) International Rice Research Institute, PO Box 933, 1099 Manila, Philippines;(3) Scottish Agricultural College, West Mains Road, EH9 3 JG Edinburgh, UK;(4) Institut für Angewandte Mikrobiologie, Justus-Liebig-Universität, Senckenbergstrasse 3, D-35390 Giessen, Germany;(5) Present address: Rothamsted Experimental Station, Harpenden, Hertfordshire, UK |
| Abstract: | A decline in rice yields has been associated with intensification of rice production. In continuously irrigated systems this has been attributed to a decline in soil N supply. Nutrient mineralisation and immobilisation is constrained by the quantity and nature of the organic substrates and the physico-chemical environment of the soil system itself. A flooded soil is very different from an aerobic one; electron acceptors other than oxygen have to be used. The transition to continuously anaerobic conditions associated with the intensification of wetland rice systems affects their organic matter turnover and may adversely affect their productivity. |
| Keywords: | Mineralisation Immobilisation Humification Microbial biomass Oryza sativa L. Intensive production Continuous flooding Yield decline |
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