Algal nitrogen fixation in the tropics |
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Authors: | Atsushi Watanabe and Yoko Yamamoto |
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Institution: | (1) Biological Laboratory, Seijo University, Tokyo, Japan;(2) Faculty of Agriculture, Meiji University, Tokyo, Japan |
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Abstract: | Summary a)Nitrogen fixation in rice fields. Nitrogen-fixing blue-green algae grow abundantly in tropical regions and are particularly common in paddy fields. Their
possible role in the nitrogen accumulation of soil has been studied. The most vigorous nitrogen-fixing blue-green algae have
been assessed for use as green manure in rice fields and favorable effects have been reported in India and other countries.
b)Nitrogen fixation by algae in water. The planktonic blue-green algae occur abundantly at certain time of the year in sea water and lake water, and some of them
are known to be nitrogen fixers. Certain Japanese species of blue-green algae can withstand high temperatures including ten
nitrogen-fixing species from hot-spring waters.
c)Nitrogen fixation by symbiotic blue-green algae. Certain species of blue-green algae form associations with other organisms such as fungi, liverworts, ferns and seed plants.
The relationship between these two organisms is on one occasion commensal and on others symbiotic. Certain symbiotic blue-green
algae are provided with the ability to fix the atmospheric nitrogen. |
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