In the winter and spring season, the light conditions in plastic greenhouses directly affect the growth, yield, and quality of greenhouse vegetables. So, how to improve the light conditions in the greenhouse?

1. Improve the structure of greenhouse 1 Building materials. The shed is tightened with No. 8 galvanized iron wire, which not only saves building materials but also reduces shading, which is of great promotional value. It is best to use a non-drop film for the shed film and a polyethylene film for the common film. In addition, whitening construction materials and walls can increase the reflected light and extend the service life; appropriately increasing the height of the greenhouse can also improve the lighting conditions in the shed. 2 greenhouse orientation and shed angle. It should be adjusted according to the greenhouse use time, production purpose and crop light conditions. In plastic greenhouses mainly cultivated in the spring and autumn, the shed angles can be smaller (15 or so), and the sheds are laid flat so that the transmitted light is evenly distributed and evenly distributed. In winter, the shed angle is larger (around 25). The shed was arched to facilitate lighting. 3 Shed width and back slope width. In winter production, the shed width is 6-6.5 meters, and the horizontal distance from the rear slope is 0.8-1 meter to facilitate lighting and heat preservation. In spring and autumn production, the shed is 8-9 meters wide, and the slope is 0.5 to 0.7 meters horizontally or the rear slope is removed.

2. When planting different varieties of vegetables in plastic greenhouses, it is necessary to rationally plant them in accordance with the principle of “lower in the North and higher in the South”; in addition, the strengthening of cultivation and management will also help to improve the lighting conditions in the shed; according to reports, the cucumber racks are used. The practice of tilting the front row to the south, standing upright in the middle row, and rearing northwards will increase light utilization by about 10%.

3, to maintain the clean film on the shed film on the water droplets, dust and other light conditions on the shed greatly affected. According to observations, a layer of water droplets adhered to the film can reduce the transmittance by 20-30%. After the new film is used for 2 days, 10 days and 15 days, the light in the shed can be reduced by 14% and 25% due to the contamination of dust. , 28%. Therefore, the water droplets and dust on the shed film should be cleaned and cleaned frequently; the snow should be removed promptly after snow, in order to increase the transparency and the amount of light. In addition, outside the greenhouse covered with grass and other warm materials, under the premise of not significantly affecting the temperature of the shed, the appropriate early release of the late cover, to ensure the lighting area, extend the lighting time; greenhouse after the release of humidity for half an hour after sunrise , Can reduce the surface of the water droplets, which can also increase the light transmittance.

4. Artificial light supplements In the dark winter season or in plastic greenhouses with insufficient sunlight, artificial light supplementation is particularly important. Specific requirements and practices are: 1 Fill light intensity. Artificial fill light, require light intensity to be large, with 1-3 kilolux is appropriate; 2 light source. Studies have shown that crops have the strongest absorption of red light and blue-violet light. Therefore, three light bulbs with a light source intensity of 40 watts are combined together and are irradiated at a height of 45 cm from the seedlings, and the light intensity is 3.0-3.5 kilolux and 100 watts. The high pressure mercury lamp is 80 centimeters away from the seedling, and the light intensity is 0.8-1 kilolux; 3 fill time. The winter fill light should be carried out after sunrise. Normally, it will take 2-3 hours per day and the light intensity in the shed will increase. The rainy weather will fill the light throughout the day.

5, promote the use of aluminum film reflector screen using polyester aluminum film spliced ​​into 2 meters wide, 3 meters long reflective screen, hanging in the plastic post after the upper end of the column, hanging down to the ground. In this way, the ground can be increased by 40-43%, the greenhouse temperature can be increased by 3-4°C, the ground temperature can be increased by 1.8-2.9°C, and the quality can be improved. In addition, the laying of silver gray film or aluminum foil on the ground can also increase the light intensity between the plants, so that the vegetables and vegetables can be well colored and prevent the premature decay of the lower leaves.

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