Abstract: A system for protecting an enclosed space from the effects of above- and below-normal temperatures comprises means defining an enclosed space including at least one relatively large opening, a screen-like cover over said opening containing numerous smaller openings which have been closed over with a water-removable composition comprising a water soluble, heat transfer resistant organic polymeric coating.

Abstract: A wind-damage-resistant structure for producing shade comprises a perimeter of spaced uprights surrounding a tract of land; interior uprights within the perimeter; a lower network of supporting cables fastened to the land outside of the perimeter and supported by the uprights, a shade-producing fabric cover fixed at its edges to the upper parts of the perimeter uprights and supported by the lower network of cables, an upper network of restraining cables also fastened to the land outside of the perimeter and supported by the uprights, the lower network and the cover, and holddown cables at intervals within the structure, fastened at their lower end to the land and passing upwardly through the lower network, the cover and attached to the upper network so as to restrain wind-induced upward motion of the cover.

Abstract: A vehicular herbicide spraying apparatus having a mobile support frame, a reservoir for herbicide, a spray means for dispensing the herbicide, a means for measuring the flow rate of the herbicide being sprayed, shields enclosing the spray means to protect plants from herbicide overspray in their vicinity, and cleaning means for intermittently washing off any herbicide which may be retained on the surface of the plant shield.