Sun light is an important agro-climatic resource. Solar radiation energy that can be used in agricultural production includes visible light that can be directly utilized by photosynthesis and infrared and ultraviolet light that are meaningful for agricultural production. Light quality refers to the proportion of light of different wavelengths in the light, which is different for visible light. Color light.
Infrared, ultraviolet, and visible light of different colors have important implications for improving the yield and quality of different types of vegetables. The longest wavelength infrared light can mainly provide heat. Ultraviolet light with a short wavelength has a bactericidal effect, and can also increase vitamin C in the skin. Therefore, the content of vitamin C in tomatoes, cucumbers and other vegetables growing in greenhouses is lower than that in open cultivation. Artificially increase ultraviolet radiation, you can increase the vitamin C content.
In order to improve the quality of different vegetables, plastic films of different colors can be used. Because the absorption and reflection laws of different colored films on the spectrum are different, the effects on vegetable growth, weeds, diseases and insect pests, and the ground temperature are also different. For example, the green film is used for growing vegetables such as strawberries, beans, eggplants, sweet peppers, tomatoes, melons, and the like, which can better control weeds. Under the red plastic film, the carrot root grows longer, the leek leaves are thick and fleshy, and the harvest period is advanced and the yield is increased. The purple film is mainly suitable for the cultivation of solanaceous and green leafy vegetables in greenhouses or plastic greenhouses in winter and spring, which can improve quality and increase yield. Covering the cucumber with a yellow film can promote bud blossom and increase yield, cover celery and lettuce, plant growth is large, and bolting is postponed.
Therefore, when planting different kinds of vegetarian dishes, the corresponding colored film should be selected to make the products more distinctive and yield better.
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