If the tip of the blade is drooping at the seedling stage, the green color or the edge of the cotyledon will turn white and curl upwards, which is caused by the sudden temperature drop in the greenhouse. In production, weather protection should be done as soon as possible according to weather changes: Keep daylight temperatures between 22°C and 25°C, and keep night temperatures between 15°C and 18°C. While ensuring the temperature, pay attention to the humidity in the shed. If the tips of the leaves are yellow, it may be due to water shortage or excessive fertilization in the soil caused by physiological water shortages. In the management, watering should be appropriate to keep the water holding capacity of the soil at 85% to 90%. During the fruiting period, if the leaves are shriveled, the leaves are thickened, and the leaves are pale yellow and dull, which is caused by the low temperature in the greenhouse. When severe, the leaf margin turns white. In production, insulation should be strengthened so that the temperature is maintained at 25°C to 29°C during the day and 18°C ​​to 22°C at night. The minimum temperature must not be lower than 13°C to ensure normal plant growth and development. At the same time, several times of cultivating, potassium humate fertilizers are applied to raise the temperature of the soil and promote root development. Make the plants robust. If the leaves are curled upwards and the leaf edges are light yellow, most of the temperature in the shed is too high and the air humidity is too high. This phenomenon often occurs in the early bud stage of cucumber. Ventilation, dehumidification, and disease prevention should be enhanced by ventilation, increase the amount of irrigation water, keep the temperature below 35°C, and keep the humidity at about 75%. If the blades become larger and thinner, and the internodes are longer, they are mostly caused by high temperature, high humidity, and low light in the shed. In production, in addition to ventilation and dehumidification, a light curtain can be suspended on the rear wall of the greenhouse to increase the light intensity in the shed, especially at the rear. If it suddenly clears after a continuous cloudy day, the leaves of the plant suddenly lose water and wilting. This is caused by the sudden opening of the straw curtain and the increase of photosynthesis, and the lack of water supply. You can take the method of pulling the curtain when placing the straw curtain. Each bed is pulled one by one so that the plants in the greenhouse will not be discomforted due to rapid environmental changes. After the plants adapt to the climate, they are completely pulled apart to prevent their water loss and wilting. If the leaves hang on the edge of cucumber leaves early in the morning, this phenomenon is physiologically called "spray" and is normal. However, due to the prevalence of diseases at this time, pesticides should be applied in a timely manner to prevent diseases. Can use 5% chlorothalonil aerosol to fumigation in greenhouses, which can play a variety of effects such as dehumidification, disease prevention, and treatment. It is worth a try. Tris(Hydroxymethyl)Aminomethane Buffer Raw Material,High Purity Extract,Tris Hydroxymethyl Aminomethane,Active Pharmaceutical Intermediates XINGZHILIAN BIOLOGICALR&D CO.,LTD , https://www.xzlsdslds.com