2. If the tip of the blade is yellow, it may be caused by lack of water or excessive water application in the soil, which should be properly watered in management, so that the soil water holding capacity in the field is maintained at 85% to 90%. 3. If the leaves are shrunk during the flowering period, the leaf flesh becomes thicker, the leaves are light yellow and dull, and the temperature is too low in the greenhouse. In severe cases, the leaf margin turns white. In production, the insulation should be strengthened to keep the temperature at 25 ° C ~ 29 ° C during the day and 18 ° C ~ 22 ° C at night. The temperature should not be lower than 13 °C to ensure the normal growth and development of the plant. At the same time, it is necessary to cultivate several times, apply humic acid potassium fertilizer to increase the ground temperature, promote root development, and make the plants grow strong. 4. If the blade is curled upwards and the leaf edge is light yellow, it is mostly caused by excessive temperature in the shed and excessive air humidity. This phenomenon occurs mostly in the early stage of cucumber bud. Ventilation, dehumidification, and disease prevention should be enhanced ventilation, increase the amount of irrigation, keep the temperature below 35 °C, and maintain the humidity at around 75%. 5. If the blade becomes larger and thinner, the internode lengthens, mostly caused by high temperature, high humidity and low light in the shed. In production, in addition to ventilation and dehumidification, a reflective curtain can be hung on the rear wall of the greenhouse to increase the light intensity in the shed, especially at the rear. 6. If it suddenly clears after continuous cloudy days, the leaves of the plant suddenly lose water and wilting. This is due to the sudden opening of the straw curtain, the photosynthesis is intensified, and the water supply is insufficient. You can take the curtain when you put the straw curtain. , that is, pulling a bed every other bed, so that the plants in the shed will not cause discomfort due to the sharp environmental changes. After the plants adapt to the climate, they will be completely opened to prevent their water loss and wilting. 7. If the water droplets are hung on the edge of the cucumber leaves in the morning, this phenomenon is physiologically called "spitting water", which is a normal phenomenon. However, since the disease is prone to epidemics at this time, it is necessary to apply the drug in time to prevent the disease. 5% chlorothalonil aerosol can be used for fumigation in greenhouses, which can play various effects such as dehumidification, disease prevention and treatment. It is worth a try. Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone Digital Imaging Equipment,X-Ray Equipment And Accessories,16 Slice Ct Scan,Ct Scanner Shanghai Rocatti Biotechnology Co.,Ltd , https://www.ljdmedicals.com
Greenhouse cucumber management
1. If the tip of the leaf is drooping at the seedling stage, the color is green or the edge of the cotyledon turns white and curls upwards, which is caused by sudden cooling in the greenhouse. In the production, according to the weather changes, early insulation and cold protection work: keep the daytime temperature at 22 °C ~ 25 °C, the night temperature is maintained at 15 °C ~ 18 °C, while maintaining the temperature while paying attention to control the humidity inside the shed.