1College of Landscape and Ecology，Hebei University of Engineering，Handan 056009，Hebei，China；2Institute of Vegetable Science， Beijing Academy of Agricultural and Forestry Sciences，Beijing 100097，China；3Key Laboratory of Urban Agriculture of North China，Ministry of Agriculture and Rural Affairs，Beijing 100097，China
Abstract：In order to restrain the occurrence of bacterial diseases of hydroponic fast-growing cabbage caused by high temperature during summer，this experiment took‘Jingyankuaicai No.4’as test material，adopted the method of introducing ozone aeration into the circulating nutrient solution and studied the suppression condition of bacterial diseases of fast-growing cabbage by different frequencies of ozone disinfection and effects on yield and quality．The results showed that along with the increase of ozone introducing frequency，the bacteria contents in nutrient solution significantly decreased．And incidence of soft rot disease in fast-growing cabbage also decreased gradually．Different frequencies of ozone treatments could all reduce significantly the microbial species in nutrient solution．Introducing ozone into nutrient solution had promote of growth and quality on fast-growing cabbage plants．Among them，T2（pass once every 3 days，10 min each time）had the best comprehensive effects．The fresh and dry weights of above-ground part，soluble sugar content，and soluble protein content of fast-growing cabbage plants were all significantly higher than that of the contrast．
