1993 Volume 55 Issue 3 Pages 105-111
As a counterplan for non-chemical control of cucumber in soilless culture, the sterilizing effects of ozone on nutrient solution and the tolerance of cucumber plant to ozone were evaluated.
When the microconidia of Fusarium oxysparum f. sp. cucumerinum were exposed to various ozone concentrations and for various periods, the concentration of 0.25mg/l was considerably effective and 0.4mg/l was complete, but 0.10mg/l was not effective. On the effects of exposure period, there was not significant difference among these experimental treatment sections.
By soaking the plant root into ozone solution, the concentrations of 0.2-0.3mg/l caused injury of plant growth but 0.1mg/l caused little injury. Therefore, a practical and effective method should be as follows: the filtered solution is stored at regular intervals in a tank, and exposed with about 0.4mg/l, and then returned back after decreased to below 0.1mg/l.
