Light conditions in the greenhouse directly affect the growth, yield, and quality of the vegetables. Especially in rainy weather, the light is weak. The lack of light in greenhouse vegetables is a common problem. Insufficient illumination not only fails to produce more vigorous photosynthesis, but also reduces transpiration, and plants grow weakly, which affects the yield and quality of vegetables. Therefore, it is necessary to take some effective measures to improve the lighting conditions in the greenhouse and to produce vegetables in greenhouses. Measures are:

Reasonable layout When planting different kinds of vegetables in the greenhouse, follow the principle of “lower from the north to the south” to make the plants taller and orderly, and minimize the 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.

Keeping the shed film clean of water, dust, and other debris on the shed 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, it is necessary to regularly clean, wash the dust, dirt and water droplets on the surface of the house, and keep the surface of the film clean to increase the transparency of the film.

Under the premise of doing a good job of insulation work, properly uncovering the straw curtain, appropriately removing the straw curtain used for heat preservation and delaying the lid curtain, can prolong 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.

The drip-free membrane drip-free membrane has been formulated with several performance-active agents in the production formula so that the affinity between the water molecules and the membrane is greatly reduced, and water droplets flow along the membrane 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.

Set the reflective screen with a width of 2 meters, 3 meters long aluminized film reflector, hanging in the north side of the greenhouse so that it is perpendicular to the ground, can increase the ground light about 40%, the temperature of the greenhouse increased 3 °C -4 °C. In addition, laying silver-gray film on the ground can also increase the light intensity between plants.

Doing a good job of planting in a timely manner Pruning, squatting, tying up vines, playing the old leaves and other field management, is conducive to ventilation and light conditions in the shed.

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, sunlight is collected in greenhouses, which plays an important role in increasing the yield and quality of vegetables.

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