Nitrogen-Fixing Activity in Upland and Flooded Rice Fields1
- T. Yoshida and
- Rosabel R. Ancajas2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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