The moist soil on the front of the greenhouse will inevitably increase the air humidity in the front, so the disease is often the first to happen on the cutting-edge crops. In order to avoid the front soil moisture, before the greenhouse buckle film, we must first set the cold-proof ditch in the inner edge of the film. The grass in the ditch should be higher than 10 cm above the greenhouse floor to make it into a high ridge shape, cover the grass with plastic film, and then On the southern edge of the damp-proof ditch grass mulch, cover 5 cm thick crushed grass, and then buckle the membrane. In this way, the water flowing from the membrane flows from the grass cover layer between the membrane and the ground film into the cold ditch, and no longer flows into the front soil. This prevents the front soil from becoming excessively humid and reduces the incidence; at the same time, it can prevent the cold. The broken grass in the ditch absorbs water and ferments and rots, releasing heat to increase ground temperature, releasing carbon dioxide, and providing raw materials for photosynthesis.
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