Analysis of Improvement of Low Light Environment in Vegetable Cultivation
1. Build a high-standard solar greenhouse. Solar greenhouses are constructed in strict accordance with the second-generation "7315" new type greenhouses: span 7 meters, height 3 meters, wall thickness 1 meter, azimuth angle 5 degrees south west, front roof angle 30 degrees, rear roof elevation angle 35 Degree, forming an arch circle.
2, choose a high transmittance, good insulation film. EVA three-layer compound drip-drop greenhouse solar greenhouse film, PE non-drip mist longevity film and polyvinyl chloride non-drip film, etc. are the main products.
3, wipe the clean shed face in time. Every day, cleaning dust on the outside of the shed film, grass clippings, etc., by using tools such as dustpans can significantly increase the brightness. If there are water droplets on the inner wall surface, it can be eliminated by blowing air or using cloth strips. According to observations, a layer of water droplets is attached to the film mouth, which will reduce the light transmittance by 20-30%. Remove snow in time after snow, in order to increase the amount of light.
4, timely cover straw and paper quilt. Under the premise of guaranteeing the temperature, the cover covers the cover as early as possible, and on the premise that the vegetables in the greenhouse are not affected by the low temperature on cloudy days, the grass curtain must be opened to increase the scattered light in the shed.
5, indoor hanging light curtain. Agricultural reflective screen is a composite polyester aluminum film. After the aluminum film is coated with aluminum, it forms a bright mirror surface. Hanging on the spine or the north wall of a greenhouse, the light that hits the curtain can be reflected on the floor and the plants in front of the curtain, which can significantly increase the indoor light intensity. According to observations, it is generally possible to increase the light intensity near the ground by 40-45%, increase the temperature in the shed by 3-4°C, and increase the ground temperature by 1°C at 5cm.
6, artificial light. Common artificial light sources for greenhouses include incandescent, fluorescent, and mercury lamps. Artificially supplemented light can be used as an emergency measure to improve lighting conditions in sheds due to its high cost and inapplicability in large areas.
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