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 well in advance according to weather changes: keep daytime air temperature at 22°C~25°C, nighttime temperature at 15°C~18°C; if the tip of leaves is yellow, it may be due to lack of water or soil Excessive fertilization results in physiological water shortages, and proper watering is required in the management to keep the soil water holding capacity between 85% and 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, heat preservation should be strengthened so that the temperature is maintained at 25°C to 29°C during the day and 18°C ​​to 22°C during the night. The minimum temperature must not be lower than 13°C to ensure normal plant growth and development. At the same time, many cultivators are also required to raise the ground temperature and increase the heat capacity inside the greenhouse. If the leaves are curled upwards and the leaf edges are light yellow, the temperatures in the shed are too high and the air humidity is too high. This phenomenon is often seen in cucumbers. Early buds. Ventilation, dehumidification, and disease prevention should be enhanced ventilation, increase the amount of irrigation, so that the temperature is controlled below 35 °C, the humidity is maintained at about 75%; if the leaves become larger and thinner, internodes lengthen, mostly high temperature, high humidity in the shed, Caused by weak light. 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 the leaves hang on the edge of a cucumber blade in the morning, this phenomenon is physiologically called. The "splashing water" is a normal phenomenon. 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, can play a variety of effects such as dehumidification, disease prevention, and treatment, and it is worth promoting.
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