Titlebook: Microbiology of Tropical Soils and Plant Productivity; Y. R. Dommergues,H. G. Diem Book 1982 Martinus Nijhoff/Dr W. Junk Publishers, The H

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Nitrogen balance in tropical agrosystems,oduction of food crops to keep pace with the growth of the world’s population. Problems associated with these attempts include the high energy demand incurred in the industrial fixation of fertilizer nitrogen, and the inefficiency of fixed nitrogen when used for the increase of crop production. This

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Nitrogen fixation by legumes in the tropics,s, with their ability to reduce atmospheric nitrogen to a usable form of nitrogen, should be an important component of tropical agrosystems. Although some nodulated legumes have an outstanding potential for fixing N. (. and . can fix up to 500 kg N ha. yr., Table 1), many of them fail to achieve the

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Heterotrophic N2 fixation in paddy soils,n becomes a limiting factor for crop production. In many parts of Asian rice-growing countries, chemical fertilizers are not yet commonly used and rice yields greatly depend on the natural fertility of paddy soils. Ancient farmers practiced the burnt-land type of agriculture to produce their food, m

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N2-fixing tropical non-legumes, of dicotyledonous angiosperms. These plants occur in a wide variation of habitats and show a large range of morphological forms. Some of them are small prostrate herbs (e.g. . spp.), others shrubs (e.g. . spp. and . spp.), while others are stout tree-like woody species (e.g. . spp. and . spp.).

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,Free — living blue — green algae in tropical soils, fertilizer. However, biological N. fixation requires energy generally obtained by the catabolism of photosynthetically fixed carbon (photosynthate). Among the N. -fixing microorganisms, only blue-green algae (BGA) are able to generate their own photosynthate from CO. and water. This trophic indepen