ISHS Acta Horticulturae 98: Symposium on Research on Recirculating Water Culture
EFFECTS OF CHLORINE AND ULTRA-VIOLET LIGHT IN DISEASE CONTROL IN NFT |
| Authors: | J.M. Ewart, J.R. Chrimes |
| Abstract:
Both chlorination and irradiation with ultra-violet light (uv) appear to have potential as methods of disease control. Two experiments in which these treatments were applied are described. Both treatments were shown to be effective in reducing numbers of potentially pathogenic types of bacteria in the nutrient solution. Chlorination, when used at dosage rates which were as effective as uv, was found to cause root damage. The treatments were found to have a coincidental effect on dissolved oxygen (DO) concentration. Both treatments resulted in increased concentration of DO but the magnitude and nature of concentration differences appeared to be influenced by other factors, in particular nutrient-solution flow-rate and turnover time. | |
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