Abstract
Abstract During the study on the distribution of blue-green algae which was carried out to evaluate the practical significance of nitrogen fixation by blue-green algae in the nitrogen economy of paddy soils, some soils, in which the autochthonous algae could not grow vigorously, and as a matter of course, their nitrogen fixation was also Very poor notwithstanding every encouraging treatment such as fertilization by potassium phosphate, adjustment of soil reaction by calcium carbonate or inoculation of a nitrogen-fixing blue-green alga, were found.
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