Difference of soil biological responses to amendment with okara and coffee residue compost or cow manure compost

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  • Sato Erika
    Tokyo University of Agriculture and Technology:National Agricultural Research Center for Western Region
  • Toyota Koki
    Tokyo University of Agriculture and Technology
  • Takeda Hajime
    Kanagawa Agricultural Technology Center
  • Okumura Ichi
    Kanagawa Agricultural Technology Center

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The Kanagawa Agricultural Technology Center has been testing the effect of a compost consisting of okara and coffee residue (OC) on Japanese radish cultivation since 1996. It is known that damage by the root-lesion nematode to Japanese radish was less severe in OC-soil than in a soil amended with cow manure compost (CM). In this study, the effects of amendment with OC-compost on soil communities of nematodes and microbes were investigated and compared with those of amendment with CM and chemical fertilizer (CF) in 2006 and 2007. There were no significant differences in total carbon among the three soils, but the soil microbial biomass was significantly higher (ca. 2.5 times) in OC- and CM-soils than in CF-soil. Glucose decomposing activity was the highest in OC-soil, followed by CM-soil and then CF-soil. There was no significant difference in the density of the root-lesion nematode, but that of free-living nematodes was significantly higher in OC- and CM-soils than in CF-soil. The community structures of nematodes and fungi in the soils and of bacteria on the Japanese radish surface, as analyzed by PCR-DGGE, were different among the three soils in both years, while the soil bacterial community was not different. Unique bands were detected in OC- and CM-soils in most of the DGGE profiles, suggesting enrichment of specific microbes and nematodes by the organic matter application. Collectively, amendment with OC- and CM-compost increased the soil microbial activity and biomass and affected the soil microbial and nematode community structures. OC-compost increased the soil microbial activity more than CM-compost did.

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  • 土と微生物

    土と微生物 65 (1), 18-26, 2011

    日本土壌微生物学会

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