The economic benefits of planting vegetables in winter are relatively high. However, in winter, not only is the temperature low, but also the shortest period of light time in a year. Without scientific management, it will make the overwintering of cucumbers, tomatoes, peppers and other crops grow weak and early, even Multiple diseases occur at the same time, resulting in reduced production. First, a reasonable layout. When planting different types of vegetables in greenhouses, the principle of “lower height from the north to the south†should be followed, so that the plants can be staggered and arranged in an orderly manner, minimizing mutual obstruction. Transplanting the same kind of vegetables, trying to make the seedlings the same size, so that the plants grow neatly and reduce shading between the plants. At the same time, it is better to do planting in the north and south to make it as sunny as possible. Second, keep the shed membrane clean. Water droplets, dust, and other debris on the film will reduce the light transmittance by about 30%. After the new film is used for 2 days, 10 days and 15 days, the lighting in the shed will be reduced by 14%, 25%, and 28% in turn. Therefore, frequent cleaning should be done to increase the transparency of the film. Snow should also be cleared of snow in a timely manner. Third, the choice of non-drip film. The drop-free film incorporates several surfactants in its formulation, which greatly weakens the affinity between water molecules and the film. Water droplets flow along the film surface into the ground without water droplets. The use of a drip-free membrane shed can increase the light intensity in the shed and increase the temperature of the shed. Fourth, reasonably uncover the straw curtain. Under the premise of doing a good job of heat preservation, appropriate removal of the straw curtain used for heat preservation and delayed cover curtains can extend the lighting time and increase the amount of lighting. Generally, the curtain is uncovered 0.5-1 hours after the sun comes out, and the curtain is covered half an hour before the sun goes down. Especially in the rainy days when it rains, it is necessary to properly uncover the sun's scattered light. Fifth, set the light curtain. With a 2-meter-wide, 3 meter-long aluminized film reflector, hanging on the north side of the greenhouse to make it perpendicular to the ground, it can add 40% light to the ground, and the temperature of the shed can increase by 3-4°C. In addition, laying silver-gray film on the ground can also increase the light intensity between plants. Six, do a good job of plant finishing. Timely pruning, hiccups, vines, old leaves and other field management are conducive to ventilation in the shed.
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