EFFECT OF CO_2 ENRICHMENT AND NITRATE APPLICATION ON VEGETATIVE GROWTH AND DINITROGEN FIXATION OF WILD AND CULTIVATED SOYBEAN VARIETIES
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概要
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A wild soybean variety (Glycine soja Sieb. and Zucc. line Nakei-No. 1) and a cultivated soybean variety (Glycine max L. Merr. cv. Tamahomare) were subjected to CO_2 enrichment and/or NO_3-N application (50 and 300 ppm), and the growth and dinitrogen fixation in the vegetative growth stage were examined. 1. The whole plant weight of the cultivated soybean variety was more promoted by CO_2 enrichment than by NO_3-N application, while that of the wild one was enhanced by NO_3-N application compared with CO_2 enrichment. 2. The dinitrogen-fixing activity Which was lower in wild soybean variety than in the cultivated one increased by CO_2 enrichment in both soybean varieties, when nitrate was not applied to the plants. The increase by CO_2 enrichment was remarkable in the cultivated soybean variety and was negligible in the wild one. In both soybean varieties, the dinitrogen fixing activity decreased by the application of 50 ppm NO_3-N and recovered approximately to the same level as that in the plants which did not receive NO_3-N as a result of CO_2 enrichment. 3. The increment of whole plant N in the cultivated soybean variety was markedly enhanced by either CO_2 enrichment or NO_3-N application, while that in the wild soybean variety was slightly enhanced by NO_3 application and did not change by CO_2 enrichment. However, the simultaneous supply of CO_2 and NO_3-N enhanced remarkably the increment of whole plan N in both soybean varieties. These results indicate that the CO_2 enrichment increased the dry matter production in the cultivated soybean variety along with the increase of dinitrogen-fixing activity, while in the wild one dry matter production increased slightly. On the other hand, the increase of dry matter production by NO_3-N application was less appreciable in the cultivated soybean variety but larger in the wild one compared with the increase by CO_2 enrichment, respectively. The simultaneous supply of CO_2 and NO_3-N increased remarkably the dry matter production in both soybean varieties. Therefore, it is assumed that the vegetative growth of the cultivated soybean variety is predominantly limited by the insufficient supply of photo-synthates, whereas that of the wild one is mainly limited by the insufficient supply of N due to lower dinitrogen fixaton by nodules.
- 社団法人日本土壌肥料学会の論文
著者
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FUJITA Kounosuke
Faculty of Applied Biological Science, Hiroshima University
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Fujita K
Department Of Environmental Dynamics And Management Graduate School Of Biosphere Science Hiroshima U
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Fujita K
Graduate School Of Biosphere Science Hiroshima University
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Fujita K
Department Of Environmental Dynamics And Management Graduate School Of Biosphere Sciences Hiroshima
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Fujita Kounosuke
Faculty Of Applied Biological Science Hiroshima University
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Ogata Shoitsu
Faculty of Applied Biological Science, Hiroshima University
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Masuda Taizo
Faculty of Applied Biological Science, Hiroshima University
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KOGURE Kazutoshi
Faculty of Applied Biological Science, Hiroshima University
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Masuda Taizo
Faculty Of Applied Biological Science Hiroshima University
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Ogata S
Faculty Of Applied Biological Science Hiroshima University
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Ogata Shoitsu
Faculty Of Agriculture Hokkaido University
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Kuwata K
Hiroshima Univ Higashihiroshima Jpn
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