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Nitrogen-Fixing Activity in Upland and Flooded Rice Fields¹

ABSTRACT

The acetylene reduction and ¹⁵N methods showed that under field conditions of rice (Oryza sativa L.) culture nitrogen fixation ranging from about 3 to 63 kg/ha occurred in soil, water, and the rice plant rhizosphere. The greatest fixation occurred in the rhizosphere and was more pronounced under flooded than under upland conditions. The nitrogen-fixing activity in flooded soils increased after the panicle initiation stage of the rice plant. It was higher in the planted soil than in the unplanted soil.

¹ Contribution from The International Rice Research Institute, Los Banos, Laguna, Philippines. Mailing address: P.O. Box 583, Manila, Philippines.

² Soil Microbiologist and Assistant Soil Microbiologist.

Received for publication June 7, 1972. Accepted for publication October 4, 1972.

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