FATE OF NITROGEN IN SOILS PLANTED TO SOYBEAN CROPS

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概要

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• Investigations on the fate of fertilizer nitrogen in the soil-plant ecosystem were carried out. Soybean plants (Glycine max, nodulating A62-1 and non-nodulating A62-2 varieties) were grown under greenhouse conditions in two kinds of soils, Light Colored Andosol and Yellow Soil. Tagged ammonium sulfate, enriched to 20.6 atom %^<15>N was applied as N fertilizer to pots, with and without plants, at the rate of 100mg N/pot (100kg N/ha). The percentage of fertilizer N recovered by the plants was as follows : 67.4% for the nodulating cultivars and 62.4% for the non-nodulating cultivars in the Andosol; while 50.5% for the nodulating soybeans and 49.4% for non-nodulating soybeans in the Yellow Soil. As for the unaccounted portion in the soil-plant system, the nodulating and the non-nodulating isoline showed a percentage of 18.6 and 22.8% respectively in the Andosol and 26.5% in the unplanted soil. In the Yellow Soil, 30.2 and 31.1% were not recovered in the nodulating and non-nodulating isolines respectively, while the unplanted soil gave a value of 21.2%. Soybean grown in the Andosol derived 21, 27, and 50% of the total plant N from fertilizer, soil and air, respectively, while the corresponding values in the plants grown in Yellow Soil were 29, 48, and 23%. Both the fraction of atmospheric N in plant N and the amount of N_2 fixed were higher in the Andosol than in the Yellow Soil due to the presence of efficient indigenous Rhizobium populations. To estimate the degree of nitrogen fixation, results obtained by the N balance method were in good agreement with those obtained by the isotope dilution method, while the acetylene reduction method gave an underestimation of the fixation.

• 社団法人日本土壌肥料学会の論文

著者

• Yoshida Tomio

  Institute of Applied Biochetnistry, University of Tsukuba

• Chiu Chi

  Institute Of Applied Biochemistry University Of Tsukuba

• Yoshida Tomio

  Institute Of Applied Biochemistry The University Of Tsukuba

関連論文

• Variation in Natural Abundance of ^N among Plant Parts and in ^N/^N Fractionation during N_2 Fixation in the Legume-Rhizobia Symbiotic System
• In Situ MEASUREMENT OF SOIL RESPIRATION RATE BY A DYNAMIC METHOD
• FATE OF NITROGEN IN SOILS PLANTED TO SOYBEAN CROPS
• ELECTRON MICROSCOPIC STUDY OF ASSOCIATIVE N_2-FIXING BACTERIA IN ROOTS OF RICE SEEDLINGS
• SULFUR MINERALIZATION IN RHIZOSPHERE OF LOWLAND RICE
• NITROGEN FIXATION AND DENITRIFICATION IN THE ROOTS OF FLOODED CROPS
• ANALYSIS OF THE BEHAVIOR OF Rhizobium INOCULUM USING MARKED STRAIN IN THE RHIZOSPHERE OF SOYBEANS
• ATMOSPHERIC DINITROGEN FIXATION IN THE FLOODED RICE RHIZOSPHERE AS DETERMINED BY THE N-15 ISOTOPE TECHNIQUE

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