Greenhouses increase the yield of vegetables

Sunshine is a necessary condition for green plants to carry out photosynthesis. In the season when the number of light hours is small and the intensity is low, how to make greenhouses collect more sunlight has an important role in improving the yield and quality of vegetables. The main measures to increase lighting are as follows:

First, a reasonable layout. When planting different kinds of vegetables in plastic greenhouses, the principle of “lower in the north and higher in the south” should be followed, so that the plants can be staggered and arranged in an orderly manner to minimize the phenomenon of 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 so that it can receive as much sunlight 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 light in the shed will be reduced by 14%, 25% and 28% in turn. Therefore, it is necessary to frequently clean and wash the dust, dirt, and water droplets on the shelter to keep the film surface clean and increase the light transmittance 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 has added several surfactants to the formulation, which greatly weakens the affinity between water molecules and the film surface. The water droplets are easily lost along the film and keep the film surface free of water droplets. The use of a drip-free membrane shed can increase the light intensity in the shed.

Fourth, control the time to uncover the curtain. Under the premise of doing a good job of insulation work, appropriate early removal of the straw curtain and delaying the cover market can extend the lighting time and increase the amount of lighting. Generally, after the sun comes out, it will be uncovered after 0.5 to 1 hour, and the curtain will be covered half an hour before the sun goes down. In the rainy days when it rains, it is necessary to expel the curtains to make full use of the sun's scattered light to make up for the lack of direct light.

Fifth, set the light curtain. The aluminum film reflective screen, which is 2 meters in width and 3 meters in length, is hung in the north wall of the greenhouse to make it perpendicular to the ground, which can increase the lightness of the ground by about 40% and increase the temperature of the shed by 3 to 4°C. In addition, the laying of gray mulch on the ground can also increase the light intensity between the plants.

Six, do a good job of plant finishing. Timely field management such as pruning, hiccups, and old leaves will help improve the conditions for ventilation and light transmission in the shed, thereby increasing the amount of light collected.

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