Abstract
The yield of rice crops in many South Asian countries affects the food supply of almost half the world’s population. Nitrogen is the element that often 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, mainly upland rice. They had to move from land to land every 2 to 3 years because the soil fertility did not last long. However, the farmers growing rice in flooded soil have been growing it for more than a thousand years in the same rice paddies. The continuous supply of elements, particularly nitrogen, despite its removal over the years by rice crops, is considered caused by the fixation of atmospheric N2 by microorganisms in paddy soils [41]. But it is not yet certain which microorganisms contribute to the fixation of atmospheric nitrogen.
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Yoshida, T., Rinaudo, G. (1982). Heterotrophic N2 fixation in paddy soils. In: Dommergues, Y.R., Diem, H.G. (eds) Microbiology of Tropical Soils and Plant Productivity. Developments in Plant and Soil Sciences, vol 5. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7529-3_3
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