Greenhouse ditch with stress

It is very important for the greenhouse to set up the cold-proof ditch. However, at present, many greenhouses do not have a cold-proof ditch, or the cold-proof ditch is not reasonable. The greenhouse is equipped with cold-proof ditch, there are particular about the following:

First, the cold-proof ditch should not be set at the front outside the shed, but should be set in the front of the greenhouse. Dig a ditch 40 centimeters wide and 40 centimeters deep, then lay the old film on the bottom of the ditch, and then use a 90 centimeter-wide barrel-shaped plastic agricultural film from east to west. This film is equivalent to a pipe. The film tube is filled with water.

During the daytime, the temperature in the front of the greenhouse is 2°C~3°C higher than in the latter half and middle of the greenhouse, and the temperature at the front of the night is 3°C lower than the latter half, and vegetables are prone to freeze damage. The tube is filled with water and absorbs heat during the day, which does not make the temperature in the front of the shed high. In the evening, the water in the pipe will dissipate the heat accumulated during the day, which will significantly increase the temperature in the first half. When watering in the future, the water in the pipes will be poured into the ground and the water will be poured in warm water without reducing the temperature of the ground.

2. On the south side of the membrane tube, close to the outer edge of the greenhouse, vertically fill 40 cm deep and 3 cm thick hay. The surrounding and bottom of the hay are wrapped with plastic film. After such treatment, the water flowing from the greenhouse membrane will flow down to the grass. The grass will be fermented after being exposed to moisture, and the fermentation will release carbon dioxide, which will not only play a role in keeping warm, but also provide the greenhouse with the carbon dioxide needed for crop photosynthesis. The biggest benefit of this treatment is to solve the problem of the front soil moisture. In the original greenhouses, the front membranes were directly placed on the ground. As a result, the water flowing from the membranes accumulated in the front soil, causing the front soil to become too wet and eventually causing the front crop downy mildew, gray mold, When the disease occurs and the disease spreads further, it will infect the entire greenhouse.

Third, the greenhouse on both sides of the gable and the back wall also need to set the cold ditch, 20 cm wide, 30 cm deep, filled with wheat stubble or wheat straw, but also step on the solid, do not have to cover the film. These grasses can not only prevent the heat from being transmitted, but also absorb moisture, reduce the humidity and reduce the occurrence of diseases. After absorbing the tide, these grasses can also ferment, release carbon dioxide, and solve the problem of insufficient carbon dioxide in the shed. Therefore, the cold-proof ditch must be located in the shed. Do not set it outside the shed. Gables and cutting edges must be set.

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