| Abstrakt: |
The aim of this work was to assess the potential suppression of three on-farm green composts for controlling seven soil-borne pathogens in container media under greenhouse condition. Suppression of Pythium irregulareand Rhizoctonia solanidamping-off of cucumber and bean, Phytophthora cinnamomiand Sclerotinia minorroot rot of azalea and lettuce, and Fusarium oxysporumwilt of melon, tomato, and basil was studied on artificially inoculated seedlings. Three feedstocks of bioenergy wastes and agricultural residues were selected, on-farm composted, characterized, and tested for their suppressive properties by in vitro and in vivo experiments in comparison with one commercial compost from municipal solid biowaste. The composts showed differences in the suppressive properties when mixed with sterile peat at dosage of 35%. All green composts meanly suppressed P. irregularedamping-off of cucumber of 80%, R. solanidamping-off of bean of 75%, P. cinnamomiroot rot of azalea of 65%, and Fusariumwilt of up to 25%. The reference compost suppressed F. oxysporumwilt of melon, tomato, and basil from 60 to 70% and Pythium, Rhizoctonia,and Phytophthoradiseases up to 30%. All composts suppressed S. minorroot rot of lettuce of 35%. Suppression of Pythiumdamping-off and Phytophthoraroot rot was related to the sum of the bioactivities of the fungi and bacteria of compost. Suppression of Rhizoctoniadamping-off and F. oxysporumwilt was associated with the specific bioactivity of a restricted number of fungi (Trichoderma, Aspergillus) and bacteria (Pseudomonas, actinomycetes) species. Suppression of Sclerotiniaroot rot was not related to any one variable of composts. |
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