15N2 incorporation by rhizosphere soil influence of rice variety, organic matter and combined nitrogen
| ISSN: |
1573-5036
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| Keywords: |
Combined nitrogen ; 15N2 incorporation ; Rhizosphere soil ; Rice straw amendment ; Variety
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| Source: |
Springer Online Journal Archives 1860-2000
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| Topics: |
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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| Notes: |
Summary Heterotrophic nitrogen fixation by rhizosphere soil samples from 20 rice cultivars grown under uniform field conditions was estimated employing15N-tracer technique. Rhizosphere soil samples from different rice cultivars showed striking differences with regard to their ability to incorporate15N2. Rhizosphere samples from rice straw-amended (3 and 6 tons/ha) soil exhibited more pronounced nitrogen-fixing activity than the samples from unamended soil; while the activity of the rhizosphere samples from soils receiving combined nitrogen (40 and 80 kg N/ha) was relatively low. However, the inhibitory effect of combined nitrogen was not expressed in the presence of rice straw at 6 tons/ha. Results suggest that plant variety, application of combined nitrogen and organic matter influence the rhizosphere nitrogen fixation.
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| Type of Medium: |
Electronic Resource
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| URL: |