Susceptibility of soils with or without repeated application of farmyard manure to bacterial wilt of tomato caused by Ralstonia solanacearum
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概要
- 論文の詳細を見る
Three types of soil, CF-soil (amended with chemical fertilizers for 14 y), CF+FYM-soil (amended with chemical fertilizers and 40 t ha^<-1> y^<-1> of farmyard manure for 14 y) and FYM-soil (amended with 400 t ha^<-1> y^<-1> of farmyard manure for 14 y), were inoculated with Ralstonia solanacearum and tomato plants were grown in order to evaluate the degree of suppressiveness of bacterial wilt of tomato by the soils. More than 70% of the tomato plants showed wilt symptoms in the CF- and CF+FYM-soils after 30 days of cultivation in a climatron, whereas less than 10% of tomato plants wilted in the FYM-soil. The survival of the pathogen was higher in the CF- and CF+FYM-soils than in the FYM-soil. Soil pH appeared to affect the disease incidence in all the soil treatments, whereas it may not have been involved in the major suppression mechanisms in the FYM-soil. The disease incidence was reduced when the CF- and CF+FYM-soils were mixed with the FYM-soil, indicating that the disease suppressive property of the FYM-soil could be transferred. When the FYM-soil was irradiated with γ-rays, the disease suppressiveness was lost, implying that the suppressive nature of the FYM-soil could be attributed to biological factors. The disease incidence decreased when the CF-soil was amended with calcium chloride, suggesting that chemical factors might also be involved in the suppression mechanisms. Results of this study suggested that the suppression of bacterial wilt caused by R. solanacearum in the FYM-soil was due to the combined effects of biotic and abiotic factors associated with repeated application of a larger amount of farmyard manure.
- 日本土壌微生物学会の論文
- 2004-04-01
著者
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Islam Tajul
Graduate School Of Bio-applications And Systems Engineering Tokyo University Of Agriculture And Tech
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Toyota Koki
Graduate School Of Bio-application And System Engineering Tokyo University Agriculture And Technolog
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Toyota Koki
Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology
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