The effect of Azospirillum brasilense Sp7 and Azotobacter chroococcum on nitrogen balance in soil under cropping with oats (Avena sativa L.) |
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Authors: | V P Shabaev V Yu Smolin V I Strekozova |
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Institution: | (1) Institute of Soil Science and Photosynthesis, USSR Academy of Sciences, SU-142292 Pushchino, Moscow Region, USSR |
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Abstract: | Summary Pot experiments with oats were carried out to study the effect of Azospirillum brasilense Sp 7 and Azotobacter chroococcum 94K on the yield of plants, the N content of soil and the 14N balance. The plants were grown on gray forest soil under irrigation with deionized water and application of 15N-labelled fertilizer at a rate of 4 mg N 100 g-1 soil. Inoculation of plants with Azospirillum spp. and Azotobacter spp. failed to increase the plant yield. However, the increase in total N in the soil at the end of the experiment and the positive 14N balance in the soil-plant system due to increased nitrogenase activity in the rhizosphere were statistically significant. The amount of N accumulated in the soil was comparable with the rate of N applied as fertilizer. |
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Keywords: | Azospirillum brasilense Azotobacter chroococcum N content in soil 14N balance 15N fertilizer Acetylene reduction assay |
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