Enhanced Growth and Nodule Occupancy of Red Kidney Bean and Soybean Inoculated with Soil Aggregate-Based Inoculant

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Volcanic ash soil, which is widely distributed in Japan, contains a large amount of well-structured soil aggregates. By using these aggregates as carrier materials, we prepared (brady)rhizobial inoculants for red kidney bean (Phaseolus vulgaris) and soybean (Giycine max). Autoclaved soil aggregates were inoculated with Rhizobium tropici CIAT899R or Bradyrhizobium japonicum USDA110R, incubated for 15 or 21 d at 30℃, slowly airdried at 20℃ to prepare the aggregate-based inoculants, and stored at various temperatures. The populations of CIAT899R and USDA110R in the aggregate-based inoculants were maintained during several months of storage at 20℃. When the aggregate-based inoculants were mixed with soil, CIAT899R and USDA110R cells showed a remarkably improved survival in soils compared with those mixed with soil without carrier material. The effect of the aggregate-based inoculants on the growth of red kidney bean and soybean was examined in pot experiments. By placing a small amount of the inoculant just beneath the seeds at the time of sowing, plant growth was significantly enhanced compared with the use of traditional peat-based inoculant. In addition, nodule formation on the upper part of soybean roots and nodule occupancy by the inoculated strain were remarkably enhanced by the aggregate-based inoculant. It is suggested that soil aggregates might be suitable carrier materials for preparing cheap and effective (brady)rhizobial inoculants.
社団法人日本土壌肥料学会の論文

Enhanced Growth and Nodule Occupancy of Red Kidney Bean and Soybean Inoculated with Soil Aggregate-Based Inoculant

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