Nitrogen-fixing associations of fungi and bacteria have been isolated from the soil and flooring of coniferous forests. The special composition and the nitrogen-fixing activity of components in associations were determined. Pure fungal cultures did not possess the nitrogen-fixing activity. The nitrogen-fixing activity of pure bacterial cultures was always lower than that of their associatons with fungi. The possibility of existence and the specificity of species composition in the nitrogen-fixing associations of fungi and bacteria are discussed.
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