| 摘要 |
PURPOSE:To obtain the end of the subject tunnel for semi-irrigatted rice nursery for raising seedling of paddy rice plant, having easily buildable and easily ventilable structure, by using a frame having a circular upper edge and a straight lower edge and forming an end of the frame in rotatable manner. CONSTITUTION:A cover 4 is rotatably attached to a lower edge 3 of a frame 1 consisting of a circular line 2 and a straight lower edge 3. The straight lower edge 3 is pushed into ground to vertically erect the frame on the ground surface. An arbitrary vinyl tunnel can be produced by stretching a vinyl film between the frames and the ventilation in the tunnel can be easily carried out simply by opening or closing the cover. |
