In greenhouse cucumber production, the temperature and humidity of soil and environment can be expressed according to the growth status of cucumber leaves. As long as we observe carefully and adopt corresponding management measures, we can reduce cucumber diseases and achieve high yield and high efficiency.
First, the seedling stage: the tip of the blade is drooping, the color green or the edge of the cotyledon turn white and curl upwards, which is caused by sudden cooling in the greenhouse. Should be based on weather changes, early insulation and cold work: the daytime temperature is maintained at 22 °C ~ 25 °C, the night temperature is maintained at 15 °C ~ 18 °C, while ensuring the temperature at the same time pay attention to control the indoor humidity.
The tip of the blade is yellow because it is caused by water shortage or excessive fertilization in the soil. Water should be properly watered to keep the water holding capacity of the soil at 85% to 90%.
Second, the flowering period: leaf shrinkage, leaf thickening, pale yellow leaves, dull, is caused by the greenhouse temperature is too low. When severe, the leaf margin turns white. Thermal insulation should be strengthened to keep the temperature between 25°C and 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, several times of cultivating, red humic potassium fertilizers are applied to raise the temperature of the soil, promote root development, and make the plants robust.
Third, the buds of cucumbers are budding: The leaves curl upwards and the leaf margins are light yellow, which is caused by excessive temperature in the booth and excessive air humidity. Ventilation, dehumidification, and disease prevention shall be promptly conducted to increase the amount of irrigation water, so that the temperature is controlled below 35°C, and the humidity is maintained 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 addition to ventilation and dehumidification, a light curtain can be hung on the back wall of the greenhouse to increase the light intensity in the shed, especially at the rear.
IV. After a sudden overcast day, the leaves of the plants suddenly lose water and wilt. This is due to the sudden opening of the straw curtain and the increase of photosynthesis, which is caused by insufficient water supply. You can take the method of pulling the curtain when placing the straw curtain. That is, a bed is pulled across a bed, so that the plants in the greenhouse will not cause discomfort due to rapid environmental changes. After the plants adapt to the climate, they will fully pull open to prevent their water loss and wilting.
In the early morning, cucumber leaves hang water droplets on the edge. This phenomenon is physiologically called "spraying" and 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 be released in time or use 5% chlorothalonil aerosol fumigation in the greenhouse, can play a dehumidification, disease prevention, treatment and other effects.
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