At a time of severe winter, the sudden drop in temperature and the safety of winterization of facility agriculture have become the biggest concern for greenhouse growers. Professor Zou Zhirong, professor of horticulture at the Northwest Agriculture and Forestry University, proposed prevention, prevention and control, and comprehensive prevention and control.
1. Keeping warm and cold in case of severe cold and cold weather, temporarily buckle the shed according to the heat preservation of the greenhouse and the type of cultivated crops, and maintain the temperature in the shed by means of multi-layer covering, such as covering the insulation, straw curtain, and the whole old plastic. Cloth and so on. General indoor temperature should be controlled above the minimum limit. For example, the temperature of fruits and vegetables should be controlled at about 8 to 10 degrees Celsius.
2. The time for irrigating vegetables in greenhouses carefully should be performed before cold injury occurs. In cloudy, rainy and snowy weather, watering should be avoided because improper irrigation at this time will cause the soil temperature to decrease and affect crop growth.
3, appropriate temperature compensation When the temperature within the shed fell below 8 degrees Celsius, should immediately take the temperature measures. However, it is necessary to pay special attention to the auxiliary heating as long as the crop is free from freezing damage, must not raise the indoor temperature too high, affecting its normal development.
4, timely clear snow in case of snow weather film snow on the greenhouse, should promptly clear the snow. The snow on both sides of the greenhouse should also be cleared in time to prevent absorption of large amounts of heat during melting and reduce the temperature inside the shed. When removing snow, damage to the shed film should be avoided as much as possible.
5, timely fill light in the event of continuous haze, rain, snow, growers should consider the installation of fluorescent or sodium light to fill light, to ensure that the crop has a healthy light source growth.
Glass Venlo Greenhouse is Spire-type glass design, design and installation of windows when more convenient and easy. Its roof slope andle can be appropriately according to the local real climate change the environment.
In Venlo greenhouse, foundation is made of reinforced concrete and the side wall is made of brick or reinforced concrete plate. the steel frame always use hot dip galvanized light steel. Roof beam adopts horizontal girder structure and using herringbone connection. The horizontal girder bears 2 or more roofs, which is made of aluminum alloy. This material is used as roof structure material and also glass inlay material. Other beams using gutter style to minimize the section. Delighting material of the roof and side wall using 4 mm thick float glass.
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