EFFECTS OF MOLYBDENUM APPLICATION ON THE YIELD, NITROGEN NUTRITION AND NODULE DEVELOPMENT OF SOYBEANS

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概要

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• Field experiments were conducted on a volcanic ash soil with low available Mo and moderate acidity for 4 years to determine the responses of soybeans and soybean nodules to Mo application with seed treatment. Mo application resulted in a 15.7% increase in the average yield of the nodulated varieties over 4 seasons. However, the genetically controlled non-nodulating variety did not respond to Mo under the same experimental conditions. Nodulated plants treated with Mo became increasingly greener from the pre-bloom stage and contained much more N in their tops during the later period of growth and accumulated considerably larger amount of N in seeds produced per unit area. These results are in agreement with the enhancement of N_2 fixing activity per plant basis during a long period covered from the stage of 2nd trifoliate leaf unfolding to that of seed development. The increase of yield obtained by the Mo application is ascribed to the improvement of N_2 fixing activity of the root nodules. The enhancement of N_2 fixing activity was mainly due to a higher activity per unit nodule weight at early stages and was due to better growth of nodules during the latter half of growth. Nodules on Mo-treated plants were characteristically larger size, had lower water content and higher Mo content. Referring to the data presented by the authors and several other investigators on available Mo in soils, soil pH, and other related factors, discussion is made that the yield response of soybeans to Mo application is expected in a good number of fields in Japan as a result of nodule response leading to the enhancement of symbiotic N_2 fixation throughout growth.

• 一般社団法人日本土壌肥料学会の論文

著者

• YAMASAKI Shin-ichi

  Hokkaido National Agricultural Experiment Station

• Hashimoto Koji

  Hokkaido National Agricultural Experiment Station:(present Address)tohoku National Agricultural Expe

関連論文

• TOTAL ANALYSIS OF MAJOR CONSTITUENTS IN SOILS BY X-RAY EMISSION SPECTROMETRY WITH A GLASS BEADS TECHNIQUE
• THE DETERMINATION OF SUB-MICROGRAM AMOUNTS OF ELEMENTS IN SOIL SOLUTION BY FLAMELESS ATOMIC ABSORPTION SPECTROPHOTOMETRY WITH A HEATED GRAPHITE ATOMIZED
• EFFECTS OF MOLYBDENUM APPLICATION ON THE YIELD, NITROGEN NUTRITION AND NODULE DEVELOPMENT OF SOYBEANS

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