Cabbage is a plant that has important economic value for farmers, and a source of nutrition for the community. But lately cabbage plants often find it difficult to cultivate, due to the presence of clubroot. This clubroot is caused by the pathogen Plasmodiophora brassicae. Various ways of controlling have been carried out to control this disease both physically and chemically have not provided good results. Utilization of biogas reactor waste (bioslurry), needs to be further investigated in addition to fertilizing plants, it can also be used as a biological control agent for pathogenic plants. Biogas reactor waste (bioslurry), both liquid and solid, is rich in microorganisms, perhaps some of which are antagonistic microbes or natural enemies of clubroot root pathogens. From the results of the study it turned out that Bioslurry was able to increase plant growth, and reduce the clubroot infection. Organic fertilizer from biogas reactor waste is good enough to increase the growth of cabbage compared to organic fertilizer used by farmers. Bioslurry from cow manure is very good to increase the growth of cabbage plants, both plant height, number of leaves and amount of leaf chlorophyll when compared with bioslurry from chicken, pork and goat manure. Bioslurry from goat manure has the lowest ability to increase the growth of cabbage. In order to protect cabbage from clubroot infection, the results of the study showed that organic fertilizer from biogas reactor waste, namely Bioslurry from Cattle could suppress clubroot infection up to , while control of clubroot root infection rates reached 85%, while bioslurry from Goats only can reduce root disease only 65%, so it is not good to use as a control device for clubroot. | Utilization of biogas reactor waste (Bio-slurry) to control of club root disease on cabbage plants (Brassica oleracea L.)
