| 摘要 |
A transparent plastic cover constructed and adapted to be deployed over and removed from a multi-acreage field. The plastic cover is supported on an appropriate beam structure and is drawn thereover by powered means. The side panels of the plastic cover contain water tubes which are drawn through a water filled trough in the ground contemporaneously with the covering operation in order to facilitate movement of the cover over its supporting structure. Upon deployment of the cover, the trough water level is lowered so as to tighten the cover down upon the structure.
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