Soil Microorganisms
Online ISSN : 2189-6518
Print ISSN : 0912-2184
ISSN-L : 0912-2184
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    2024 Volume 78 Issue 1 Pages 1-2
    Published: April 30, 2024
    Released on J-STAGE: April 30, 2024
    DOIhttps://doi.org/10.18946/jssm.78.1_1
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  • [title in Japanese]
    [in Japanese]
    2024 Volume 78 Issue 1 Pages 3-4
    Published: April 30, 2024
    Released on J-STAGE: April 30, 2024
    DOIhttps://doi.org/10.18946/jssm.78.1_3
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  • [title in Japanese]
    [in Japanese]
    2024 Volume 78 Issue 1 Pages 5-11
    Published: April 30, 2024
    Released on J-STAGE: April 30, 2024
    DOIhttps://doi.org/10.18946/jssm.78.1_5
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  • [title in Japanese]
    [in Japanese]
    2024 Volume 78 Issue 1 Pages 12-16
    Published: 2024
    Released on J-STAGE: April 30, 2024
    DOIhttps://doi.org/10.18946/jssm.78.1_12
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    [in Japanese]
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  • [title in Japanese]
    [in Japanese]
    2024 Volume 78 Issue 1 Pages 17-19
    Published: April 30, 2024
    Released on J-STAGE: April 30, 2024
    DOIhttps://doi.org/10.18946/jssm.78.1_17
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    [in Japanese]
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  • Effects of land-use and organic fertilization on soil enzyme in a farmer’s fields
    Silvio Yoshiharu Ushiwata, Ayana Kawashima, Hiroyuki Oshima, Taku Kato ...
    2024 Volume 78 Issue 1 Pages 20-25
    Published: April 30, 2024
    Released on J-STAGE: April 30, 2024
    DOIhttps://doi.org/10.18946/jssm.78.1_20
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    The soil quality is measured through the use of indicators that measure or reflect the environmental status or sustainability condition of the ecosystem. Microbial attributes are classified as biological indicators. The use of these indicators in the soil analysis routine are promising. In this research, the effect of two land uses (paddy or upland field) with two different soil management (conventional system or conventional system with previous organic matter applied) on soil microbial properties was evaluated in a farmer’s field. The soil enzymatic activities (urease, glucosidase and arylsulfatase), with exception of acid phosphatase, showed sensitive and consistent responses to the effect of soil management.　The results showed higher soil enzymatic activity in paddy than upland field. Total C and N were 1.3-1.8 times increased by organic amendments as well as N mineralization 1.8-2.4 times, while enzyme activities in upland soil 1.5-2.4 times, although 0.7-1.3 times in paddy soil. In both land-uses, the large amount of organic fertilizer applications in previous organic amendments contributed to improve the soil chemical properties and soil microbiological activities.
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  • Interaction effect between inoculations of Pantoea agglomerans and pathogenic fungus Fusarium oxysporum on the growth of sweet potato in a pot experiment
    Katsuki Adachi, Takayuki Suzuki
    2024 Volume 78 Issue 1 Pages 26-32
    Published: April 30, 2024
    Released on J-STAGE: April 30, 2024
    DOIhttps://doi.org/10.18946/jssm.78.1_26
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    We conducted a dual culture test between bacterium Pantoea agglomerans strain MY1 and pathogenic fungus Fusarium oxysporum strain BM3 to examine antagonistic activity of the bacterium. We observed the suppression of mycelial growth around the MY1-colony, which was a wetting-out action on Fusarium mycelia. In a co-inoculation pot experiment of P. agglomerans and F. oxysporum, the roots of sweet potato young plants were immersed in 30 mL of MY1 culture for 24 h to inoculate P. agglomerans before transplantation to pots, and autoclaved MY1 culture treatment was performed as an offset control of nutrients. While inoculating F. oxysporum, two 1 cm2 pieces of BM3 plate culture were attached to the side surface of the root just before transplantation. After 46 d of cultivation, the total dry weight (shoot + root) was measured and analyzed using ANOVA. The results were as follows: 1) the inoculation with BM3 significantly decreased dry weight; 2) in the effect of MY-inoculation with three levels of with and without inoculation of MY1 and addition of autoclaved MY1, there was a significant difference, but plant growth-promoting effect of the inoculation with MY1 compared to the offset control could not be detected; and 3) the interaction effect between BM3-inoculation and MY1-inoculation was significant. This interaction effect suggests that inoculation with MY1 culture suppressed the growth inhibitory effect of BM3-inoculation. These results suggest that the bacterium P. agglomerans strain MY1 has a suppressive effect on the growth inhibition caused by Fusarium stem rot fungus in sweet potatoes.
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  • [title in Japanese]
    2024 Volume 78 Issue 1 Pages 33-
    Published: April 30, 2024
    Released on J-STAGE: April 30, 2024
    DOIhttps://doi.org/10.18946/jssm.78.1_33
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    2024 Volume 78 Issue 1 Pages 34-37
    Published: April 30, 2024
    Released on J-STAGE: April 30, 2024
    DOIhttps://doi.org/10.18946/jssm.78.1_34
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