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Immobilization mineralization and availability to rice plants of nitrogen derived from heterotrophic nitrogen fixation in flooded soil

Immobilization mineralization and availability to rice plants of nitrogen derived from heterotrophic nitrogen fixation in flooded soil

Soil Science and Plant Nutrition 27(2): 169-176

ISSN/ISBN: 0038-0768

DOI: 10.1080/00380768.1981.10431268

The distribution of N immobilized by heterotrophic N2-fixing microorganisms in anaerobic soils amended with glucose among various components of the soil-N was determined by a 15N tracer method, and the immobilization and mineralization processes were compared with those from ammonium and native soil N. The availability of biologically fixed-N to wetland rice plants was also investigated. About 66% of the N originated from N2 and 72% of that from NH4+ was converted to an amino acid-N fraction after 4 days. At 20 days, 7% of the fixed-N and 13% of the applied-N was mineralized. By drying the soils, most of the mineralized-N was reimmobilized to an amino acid-N fraction. Biologically fixed-N apparently undergoes transformation processes almost similar to those of immobilized fertilizer-N. The mineralization rates were 23.4% for the fixed-N and 4.6% for the native soil-N after 16 days. The rice plants had absorbed 34% of the fixed-N and 8% of the soil-N in 42 days. In the newly immobilized-N from N2, nearly 68% of that taken up by the plants was derived from the amino acid-N fraction. The fixed-N remained as readily decomposable compounds, which were susceptible to microbial attack, making biologically fixed-N more available to the plants than native soil-N.

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Accession: 005620176

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