Abstract
Among approximately two thousand species of blue-green algae, about five hundred possess heterocysts and have the ability to fix atmospheric nitrogen. Certain non-heterocystous, filamentous algae also fix nitrogen, but only under microaerobic or anaerobic conditions. Because blue-green algae are photoautotrophic and develop in the upper soil layer, where conditions are usually aerobic, nitrogen fixation by non-heterocystous algae is much slower than by heterocystous blue-green algae. In the soils of the USSR, 133 species of heterocystous blue- green algae, among them about 30 nitrogen-fixing species are widely spread.
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