This acute death phenomenon of cucumber is rapid and difficult to control. The main reasons for its formation are:
1. Reasons for the weather: It is steep and rainy after continuous rain or snow, and the temperature rise causes rapid death.
2. Reasons for venting: Cucumber enters the stage of flowering and melon, high temperature on sunny days, large amount of air release, fast transpiration of leaves, some plants with poor roots begin to shrink, and the whole plant withered water is withered.
3. Causes of freezing damage: The freezing damage causes the surface of the greenhouse film to be partially damaged, and the cold wind hits into the wilting dead seedlings.
4. Reasons for fertilization: The concentration of fertilization is too large, especially when the fertilizer is applied near the base of the stem of the cucumber, and the burn causes the dead seedling.
The acute death of cucumbers occurs almost every year to varying degrees. For early prevention, the following measures should be taken:
1. Appropriate amount of watering: The root system of cucumber is more developed, but more concentrated in the surface of the soil to generate new roots, to avoid watering mistakes and to inhibit the growth of root groups, less watering, watering back to seedlings. Low temperature, high soil moisture, or even rainy weather, less or no watering. Into the fruiting period, combined with topdressing, with water and fertilizer, every 10 days or so, to prevent excessive fertilization of melon seedlings. It is advisable to water the water on a sunny day and avoid watering in the afternoon and evening. It is not advisable to water the whole shed in rainy days. It should be poured in small water and not flooded.
2. Reasonable control of temperature in the shed: Generally, it is not ventilated at the initial stage of planting. It is kept at 25~30°C in the daytime shed and 12~15°C at night, not less than 10°C. With the growth of melon seedlings, it is necessary to adjust the temperature and temperature in time. Generally, the temperature is raised to 30 °C during the daytime ventilation, and when the temperature drops to 28 °C in the afternoon, the film is closed. The temperature during the melon should not be lower than 12 °C.
3. Frequently arranging: The ditch road around the shed is guaranteed to be unblocked, so that it can be drained in time, and rapid water filtration is required. Every day, check whether the shed film is damaged or leaking. Pay attention to repair and keep warm. Cover the grasshoppers before the wind and cool down, and lock the ropes to prevent cold wind from invading the wounds and melons.
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