Neue Techniken zur Kompostierung. Teilvorhaben 15/3: Antagonistenpraeparate und Kompostzusaetze zur Kohlhernieunterdrueckung Endbericht

The spreading of plant by fungus disease agent through biological waste can be avoided with the help of suitable composting measures. Possibilities were investigated of combating the very resistant permanent spores of the economically significant agent of the clubroot (Plasmodiophora brassicae) by adding antagonists (Bacillus subtilis, Pseudomonas fluorescens, Streptomyces graminofaciens) and natural lime (lime gyttja). A considerable reduction in infestation was achieved under favourable climatic growth conditions (cabim-Type greenhouse in the summer months) employing tested antagonists. Positive interactions of Pseudomonas fl. and Streptomyces gr. with the natural lime additives increased the infestation reducing effect of Calcium-ions in the plant substrate. Under unfavourable growth conditions (cabin-type greenhouse in the winter months with additional lighting) only Streptomyces gr. (without natural lime additives) proved able to reduce infestation. For infested compost, the combined addition of antagonists and natural lime are recommended for suppression of clubroot after the second decomposting phase. The results of the biotests conducted show that the reproducibility is too low for any decisions to be taken on the operation of composting installations (as recommended in LAGA-Memorendum M 10) which would be of significance to waste management. (orig.)Available from TIB Hannover: F98B445+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman