PLANT GROWING PROTECTED GROUND CONSTRUCTION Russian patent published in 1998 - IPC

FIELD: agriculture. SUBSTANCE: construction has light-permeable surface 1 extending in strict horizontal plane below earth surface 2 and movable light-reflecting screen 3 positioned above light-permeable surface 1 and adapted to direct reflected sun light perpendicular to light-permeable surface 1. At night or in case of gloomy weather screen 3 overlaps earth surface so as to completely cover light-permeable surface 1. Such construction allows heat losses to be avoided. EFFECT: increased efficiency, simplified construction and reduced heat losses. 2 dwg