| 摘要 |
There is disclosed a structure for stimulating the growth of plants in the outdoors and particularly for protecting the plants from frost or excessive heat. Plastic film tubes with apertured side walls are disposed between crop rows, water-ballasted, and continuously filled with air which is vented from the sides onto the plants. The vented air is tempered by the thermal mass of the ballast water which can be made to absorb heat from the sun for distribution to the plants during periods of low temperature.
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