EFFECTS OF SOIL MICROORGANISMS ON THE GROWTH AND ON THE NITROGEN AND PHOSPHORUS ABSORPTION BY RICE SEEDLINGS

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概要

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• The growth and the nitrogen and phosphorus absorption by rice seedlings were examined under sterile and non-sterile conditions. Sterile seedlings were cultured aseptically for 2 weeks in a sterilized nutrient solutions, a half of which were inoculated with 10^<-4> diluted paddy soil suspension. In addition a short-term ^<32>P absorption experiment was carried out using rice seedlings precultured in the same way as above in a phosphate-free nutrient solution. Microorganisms retarded the growth of the seedlings, especially root elongation. However, in the presence of microorganisms the roots became thicker and they formed laterals and root hairs close to their tips. More nitrogen was absorbed by the sterile plants at 25 and 50 ppm of nitrogen, whereas more by the inoculated plants at 100 and 200 ppm. As regard to phosphorus absorption, the sterile plants absorbed more phosphorus at phosphorus levels ranging from 5 to 50 ppm. A short-term experiment with ^<32>P revealed that the sterile plants absorbed more phosphorus at the lowest concentration examined (0.01 ppm P), whereas at other concentrations (0.1-25 ppm P) no difference was detected between the sterile and the inoculated plants. The distribution pattern of absorbed nitrogen or phosphorus in the whole plant was not affected by microorganisms at any concentration tested. The growth pattern of root affected by microorganisms in the rhizosphere, especially on the rhizoplane, was suggested to be an important factor to determine the phosphorus absorption in rice plants.

• 社団法人日本土壌肥料学会の論文

著者

• TANAKA Hirofumi

  Departments of Chemistry and Physics, The Pennsylvania State University

• Tanaka Hirofumi

  Department Of Agricultural Chemistry Nagoya University:(present Address) Faculty Of Agriculture Meij

• YATAZAWA Michihiko

  Department of Agricultural Chemistry, School of Agriculture, Nagoya University

• ASANUMA Shuichi

  Department of Agricultural Chemistry, Nagoya University

• Asanuma Shuichi

  Department Of Agricultural Chemistry Nagoya University

• Yatazawa Michihiko

  Department Of Agricultural Chemistry Nagoya University

• Yatazawa Michihiko

  Department Of Agr. Chemistry Nagoya University

• Tanaka Hirofumi

  Department Of Agricultural Chemistry Nagoya University

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