COMPARISON OF ^<15>N NATURAL ABUNDANCE AND DIFFERENCE METHODS FOR ESTIMATING N_2 FIXATION OF SOYBEANS GROWN IN A TROPICAL SOIL
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概要
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A study was carried out to compare the difference or N-yield method with the ^<15>N natural abundance method for the estimation of the fractional contribution of biological N_2 fixation in the different plant parts of nodulating and non-nodulating isolines of soybeans. The results indicated that the δ^<15>N values of most plant parts of soybeans were significantly lower (p<0.05) in the nodulating than in the non-nodulating isoline. However, in the case of the root+nodule component, the δ^<15>N value was higher in the nodulating than in the non-nodulating isoline possibly due to isotopic discrimination of ^<15>N over ^<14>N which may have occurred in the nodules. Inoculation of soybeans with the Bradyrhizobium japonicum strain CB 1809 increased significantly (p<0.05) the δ^<15>N value of the root+nodule component implying that the effectiveness of the soybean-rhizobium symbiosis had increased by inoculation. Percentage of plant N derived from atmospheric N_2 fixation (%Ndfa) estimated by the ^<15>N natural abundance method was highly correlated (r=0.762, p0.01) with that by the difference or N-yield method and the differences between the two methods were not statistically significant. The agreement between the two methods was closer at maturity than at the early reproductive stage. The %dfa obtained by the difference method ranged from 48.4 to 92.6% whereas the %Ndfa obtained by the ^<15>N natural abundance method ranged from 43.2 to 92.4% in the different plant parts. Based on the ^<15>N natural abundance method, approximately 15% of the N in pod, shoot, grain, and shell was derived from the soil but in the case of stover, this fraction was about 55%.
- 社団法人日本土壌肥料学会の論文
著者
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Yoneyama Tadakatsu
Department Of Agricultural Chemistry University Of Tokyo:(present Address)division Of Environmental
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Manguiat Lreneo
Department Of Soil Science And National Institutes Of Biotechnology And Applied Microbiology (biotec
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Mendoza Danilo
Department Of Soil Science And National Institutes Of Biotechnology And Applied Microbiology (biotec
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Mendoza Danilo
Department Of Agricultural Chemistry Faculty Of Agriculture The University Of Tokyo
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PEREZ Arnel
Department of Soil Science and National Institutes of Biotechnology and Applied Microbiology (BIOTEC
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Yoneyama Tadakatsu
Department Of Soils And Fertilizers National Agriculture Research Center
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Perez Arnel
Department Of Soil Science And National Institutes Of Biotechnology And Applied Microbiology (biotec
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Yoneyama Tadakatsu
Department Of Agricultural Chemistry University Of Tokyo
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