How to improve greenhouse vegetable lighting?

Light conditions in plastic greenhouses directly affect the growth, yield, and quality of vegetables. In the winter and spring seasons, shorter sunshine hours and weaker sunshine intensity, coupled with the increase in obstructive weather such as cloudy snow, rain and fog, have a great influence on the growth of vegetables in greenhouses. Therefore, some effective measures are taken to improve the development of greenhouses. The lighting conditions are very necessary for the production of greenhouse vegetables.
The orientation, structure and material of the greenhouse: The greenhouse should be built at the leeward sunny place, facing south or grabbing yang or stealing yin, so as to receive the maximum amount of sunlight in the winter; improving the shed structure and the membrane method, trying to reduce the arch in the shed The number of racks, pillars, and tie rods can be replaced by new materials that are both durable and reduce light shading, reducing shading area. White materials are applied to building materials and walls in the shed to increase reflected light. Try to use a non-drip film as a film to increase the amount of light and increase the yield and quality of vegetables.
Reasonable collocation of vegetables in greenhouses: When planting different varieties of vegetables in greenhouses, they should be properly planted in accordance with the principle of “lower in the north and higher in the south” and planted in accordance with the plant height of the vegetables to minimize shading among the plants.
Other production and management measures: Clean the interior and exterior of the film regularly, especially after snowing, clean the snow on the top of the tent to keep the surface clean, but be careful not to damage the film during cleaning; In the premise of ensuring that the minimum temperature is above the limit temperature, try to cover the grasshoppers as much as possible to extend the lighting time; cover the entire plastic film in the greenhouse to increase the scattered light in the near-ground space and improve the lighting conditions in the facilities; the low light on the north side of the vegetable greenhouse At the same time, setting up an aluminum alloy reflective screen or hanging a silver reflective film can increase the north side of the greenhouse by 20 to 40%, and artificially fill the light in the greenhouse, especially in the winter for several consecutive days of heavy fog or When the weather is cloudy or rainy for a long time, installing incandescent lamps, fluorescent lamps, high-pressure mercury lamps, etc. to make artificial light is also an effective measure to increase the light. Usually, the greenhouse can fill light for 4 to 5 hours a day; in addition, timely treatment of vegetable plants is required. Old leaves, diseased leaves, and excessive branches appear on the tree to increase light between the plants.

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