The growth, production and quality of vegetables in greenhouses are greatly affected by light. Without sufficient light, vegetables can not only undergo vigorous photosynthesis but also reduce transpiration, which easily leads to the growth of plants. In cloudy and rainy seasons, insufficient light in greenhouses will affect the yield and quality of vegetables. Taking some effective measures to improve the lighting conditions in the greenhouses is conducive to achieving high quality and high yields in greenhouse vegetables. The following measures can be taken to improve the lighting in vegetable greenhouses:
First, layout planning should be reasonable. In order to make full use of the light, it is better to do planting in the north and the south. When planting different types of vegetables in greenhouses, the principle of “lower height from the north to the south†should be followed to make the plants staggered and orderly and reduce the phenomenon of blocking light from each other; the same kind of vegetables should be transplanted to make the plants grow neatly and reduce the shading between the plants. .
Second, keep the shed film clean. Water droplets, dust and other debris on the film will reduce the light transmittance by about 30%. Frequent cleaning and washing of dust, dirt, and water droplets on the surface of the house will help maintain the cleanliness of the film surface and increase the transparency of the film.
Third, the use of non-drip film. The advantage of the non-drip film is that the moisture in the air near the film can be adsorbed to the surface of the film, forming a water film to drip downwards, preventing and eliminating the mist in the shed, lowering the relative humidity of the air, and increasing the light intensity.
Fourth, make full use of the reflective screen. With a 3m wide and 2m thick aluminized film reflector screen hanging in the north side of the greenhouse, and with the vertical ground, can effectively increase the ground reflection. In addition, the laying of silver-gray plastic film on the ground can also effectively increase the light intensity between the plants.
Fifth, do a good job of plant finishing. During the growth of vegetables, field management such as pruning, squashing, vines, and old leaves is performed in time according to the growing conditions of the vegetables. This is conducive to the conditions of ventilation and light transmission in the sheds; in conditions of low light intensity and short duration of sunshine, conditions are available. Greenhouses can be filled with fill light, which plays an important role in improving the yield and quality of vegetables.
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