The current results of cucumber growth are in winter, with a small number of hours of sunshine and weak light. Coupled with the early release of grasshoppers, the light receiving time is even less, which limits the growth and development of cucumbers. According to the characteristics of greenhouse temperature and light distribution, during the daytime, the front has strong light, high temperature, low temperature at the front of the night, large temperature difference between day and night; at the rear, the daylight is weak, the temperature is low, the night temperature is higher than the front, and the temperature difference between day and night is small. Causes uneven cucumber growth. The adoption of a retroreflective screen improves the lighting conditions in the shed and raises the temperature and ground temperature. According to measurements, the light intensity at 0 meters, 1 meter, 2 meters, and 3 meters from the rear column was increased by 18,000 lux, 14,900 lux, 14,000 lux, and 6000 lux in the sunny days, respectively, compared with the control; the cloudy days were increased by 8000 lux and 7,500 lux respectively. , 2500 lux, 1000 lux. The average daily temperature was 1.43°C higher on sunny days and 0.88°C higher on cloudy days; the ground temperature was 10cm higher, 1.12°C higher on sunny days, and 0.36°C higher on cloudy days. At the same time, the growth and development are accelerated, the number of leaves increases, the plant height and stem diameter increase, and the female flower node decreases, which promotes the increase of yield. The method of using the light curtain: After the cucumber is planted, the light curtain will be cut into 2 meters high, hang vertically on the south or back wall of the column after the greenhouse, use the thin wire pull wire on the top, and fix the light curtain on the thin wire with a transparent tape. At the bottom of the roll, a thin bamboo basket is straightened. Removed in mid-March. Nucleic Acid Extraction Reagent Kit Nucleic acid extraction device,Nucleic acid extraction machinent,Nucleic acid extraction system Shenzhen Uni-medica Technology Co.,Ltd , https://www.uni-medica.com