Abstract

Plants grown in highly ionized air (1,100,000,000 ions to 21,000,000 per cc.) showed no significant changes in appearance or dry weight over controls, whether the treatment was applied continuously or intermittently with bright or with dim illumination. Ozone is toxic and produces necrotic spots with final desiccation of the leaf in concentration of 1 part in 1,000,000 to 1 to 8,000,000 of air. Lower concentrations of ozone, which are still easily detectable by odor, produce no stimulation of growth or other effects on the appearance of the plants. Higher concentrations, about 1 part in 100,000, produce prompt wilting and bleaching, the older leaves succumbing long before the younger upper ones. Ripening processes in tomato and banana are not accelerated by O/sub 3/. High concentrations produce spotting. These are much higher than concentrations required for spotting of leaves. 29 references, 5 figures, 2 tables.

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