Greenhouses produce more light and produce more vegetables
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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 are as follows: I. Rational layout When planting different types of vegetables in plastic 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 so that it can receive as much sunlight as possible. Second, to maintain the clean film on the shed film on the water droplets, dust and other debris, will reduce the transmittance of 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 selection of non-drip thin film in the production of the formulation of a few surfactants added, so that the affinity of water molecules and the membrane surface greatly weakened, easy to drop along the water droplets to keep the membrane surface without 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 In the premise of good insulation work, appropriate early removal of the straw curtain and delay cover curtain, can extend the lighting time, 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 to the width of 2 meters, 3 meters long aluminum film reflective screen, hanging in the north wall of the greenhouse so that the vertical ground, can add 40% light to the ground, the temperature of the shelf to increase 3 °C to 4 °C. In addition, laying silver-gray film on the ground can also increase the light intensity between plants. Sixth, do a good job in organizing the timely pruning, snoring, playing the old leaves and other field management work, help to improve ventilation and light conditions in the shed, thereby increasing the amount of lighting.