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This article in SSSAJ

  1. Vol. 37 No. 1, p. 42-46
     
    Received: June 7, 1972
    Published: Jan, 1973


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doi:10.2136/sssaj1973.03615995003700010017x

Nitrogen-Fixing Activity in Upland and Flooded Rice Fields1

  1. T. Yoshida and
  2. Rosabel R. Ancajas2

Abstract

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.

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