ISHS Acta Horticulturae 87: Symposium on Potential Productivity in Protected Cultivation
UTILIZATION OF PLASTIC FILMS FOR PROTECTED CULTIVATION |
| Authors: | T. Nakashima, S. Kagohashi, Y. Naito |
| Abstract:
Studies have been carried out since 1970 to clarify the effects of various plastic materials on the yields of vegetables. The cultivation of tomatoes and celery under the polyvinylchloride films (0.1 mm in thickness), hard boards (FRA and FRP about 0.6 mm) and glass (3 mm) manifested no difference in yields between transparent film and radiant pink color film, and it was found that other color films (orange, pink and violet) and hard boards were slightly inferior to transparent film. During the winter season, the growth of spinach and turnip under blue color film and the yields of strawberries under UVC film absorbing ultraviolet ray below 390 nm were rather higher than under that of transparent film. However, in summer season the yields of tomatoes were slightly less. Yields of tomatoes and celery under transparent glass were approximately the same as those of transparent film. In comparing the measurement of transmissivity of solar radiation under various kinds of films, hard boards and glass, transparent film and glass indicated 90–95%, color films 85–90% and hard boards 75–80% respectively. On the other hand, its transmissivity of films declined by about 20% after 10 months, though that of glass and hard boards did less than 5–10%. From the above findings it has been concluded that it is safe to assume that if transparent or radiant pink color film is renewed regularly or if UVC film is used in winter, the yields of vegetable are not inferior to that of glass. | |
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