Vegetables grown in plastic greenhouses often suffer from low light syndrome due to insufficient light. The general symptoms are poor plant growth, thin stems; thin leaves, light color, easy to yellow; poor flower bud differentiation, floral deformity, serious falling flowers; fruit growth slow, light color, miso, poor coloration. Low light syndrome has a certain impact on the yield and quality of vegetables.
The precautionary measure is mainly to improve the lighting conditions in the shed as much as possible. When planting, increase the row spacing and reduce the shading between the plants; keep the membrane clean and prevent water droplets and dust from adhering to the membrane surface; in the middle and late stages of vegetable growth, when the temperature outside the greenhouse reaches 15 °C before and after noon, some of the greenhouse film is properly uncovered. It has been proved by practice that the polyester aluminized film is used to splicing into a 2 m wide and 3 m long reflective curtain, which is hung on the upper end of the plastic shed and the lower side hangs to the ground, which can increase the ground intensity by 40-43 and increase the shed temperature. -4 °C, the ground temperature increased by 1.8-2.9 °C, the tomato yield increased by 41.8-58.1%, the fruit quality improved; the laying of silver-gray film or aluminum foil on the ground can also increase the light intensity between the plants, make the fruit color well, and prevent the lower leaves from premature aging. .
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