In recent days, heavy snow has fallen in most areas, temperatures have dropped sharply, and crop production in greenhouses is facing severe challenges. Attention should be paid to the weather conditions in a timely manner, and corresponding cold and warm measures should be taken to effectively reduce losses.

First, improve the insulation properties of the cover. After the heavy snowfall, the snow on the roof should be promptly removed to prevent the cover from being wetted after the snow melts, and the load-bearing capacity of the shed is increased. At the same time, it is also possible to increase the insulation performance of greenhouses by means of plastic film covering.

At present, the solar greenhouses in the northern part of the country are basically covered with plastic roofing films on the front roof, and are used as insulation (blankets, haystacks) outside the plastic sheds. They are collected after sunrise in the morning, and they are stored in the light and stored in the evening. Coverage method. However, the thickness of the plastic film is limited and the temperature is limited. Although the insulation has a certain thickness and density, the heat preservation has been greatly improved, but it has not yet reached the ideal requirements of the winter greenhouse insulation, especially after rain and snow, the insulation is damp, almost lost its thermal insulation performance. Insulation is covered with a full layer of polyethylene longevity film, from the rear slope of the greenhouse until the front of the greenhouse drain, the back wall with bricks (stone) every 2m interval plus weight compaction fixed front drainage Ditch can only be fixed at both ends of the pressure. After sunrise in the morning, the insulation is rolled up, and the insulation is put down after sunset to form a multi-layer insulation form with a double-layer plastic shed film clip insulation, which blocks the direct invasion of the cold insulation at night and improves the insulation effect. . According to practice, the room temperature in the greenhouse can be increased by 4 to 6°C.

Second, the ignition warming. If the crops in the greenhouse are subjected to strong cold currents and the indoor night temperature is lower than 6°C, it is necessary to carry out ignition and heating.

The best way to warm up is to ignite the biogas in the facility. Every 60-meter-long greenhouse is equipped with a biogas stove, which is fed with biogas and ignited and warmed. If there is no biogas plant, warming can be done in the evening. It should be noted that coal stoves generate harmful gases when they are burned. In order to avoid crop damage, the stoves must be manually hand-picked in the operation of the greenhouse. The burning time must not exceed 30 minutes. This method can increase the indoor temperature by 2-3 degrees, and the carbon dioxide produced by combustion can also slow down the temperature drop. When encountering a cold spell, the fire density should also be increased. In addition, igniting smoke around the greenhouse can prevent the energy around the greenhouse from radiating to the upper air and reduce heat loss.

Third, in addition to the greenhouse wall insulation layer. The specific method is: using ordinary agricultural film or old film, cut to a width of about 3 meters, film length = greenhouse length + gable length of the long, and then the film ends with an iron heating, bonding into a 10 centimeters of the sewing tube, Insert a 3-meter-long wooden stick and pull it apart to tighten the back wall and the gable. At both ends of the wooden stick, under the head into the ground in the soil, into the soil depth of 30 cm or more, with the head wrapped around the wire, fixed and the gable at the outer edge, the bottom edge of the film buried in the soil outside the wall. Then in the gap between the wall and the membrane filled with rags, thickness of about 30 cm, and then buried with dirt on the upper edge of the film on the back of the greenhouse slope. In this method, the wall heat is no longer emitted, and the night temperature in the greenhouse is significantly increased, and the temperature can be increased by 3-5 degrees. The effect of the night temperature during the period of stable and cold is obvious.

In addition, conditions can allow the use of topdressing carbon dioxide fertilizer, the construction of reservoirs and other ways to increase the greenhouse temperature. Normally, opaque coverings such as grasshoppers should be uncovered in a timely manner, and full use of light for photosynthesis should enable crops to grow robustly and enhance frost resistance.

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