What happened to the acute atrophy of cucumber in greenhouse

(agricultural get Rich Network) some cucumber plants in the greenhouse suddenly showed acute shrinkage, and melon farmers were often puzzled and had no choice but to plough and replant. In fact, this acute atrophy of cucumber is a physiological disease. The reasons for its formation are as follows: first, the temperature inversion rapidly wilts the seedlings due to continuous overcast rain or steep sunshine after snow; second, the cucumber enters the flowering and melon stage, the sunny day is high temperature, the air volume is large, the leaf transpiration is fast, and some of the plants with poor roots begin to atrophy, and those with severe water loss begin to wither; third, the film covered in the greenhouse is partially damaged, and the cold wind attacks and wilts the dead seedlings. Fourth, the concentration of fertilizer is too high, especially when chemical fertilizer is applied near the rhizome of cucumber, it is very easy to burn dead seedlings.

In order to prevent the acute atrophy of cucumber, the following measures should be taken: the seedlings should be watered at the right time: the root system of cucumber is more developed, but it is mostly concentrated on the surface of the soil. In order to promote root growth, avoid watering mistakes and inhibit root growth, one is to water less planting water; the second is to water back seedlings as appropriate, with low temperature, high soil moisture and continuous rain; third, to enter the peak period of melon formation, combined with topdressing, water with water and fertilizer, every 10 days or so, strictly prevent excessive fertilization to burn melon seedlings; fourth, it is appropriate to water melon seedlings in sunny morning. avoid watering in the afternoon and evening. Fifth, it is not suitable to irrigate the whole shed on cloudy and rainy days; sixth, it can only be infiltrated by small water, not flooded. Scientific control of greenhouse temperature: generally not ventilated at the initial stage of planting, the greenhouse was kept at 25 ℃ ~ 30 ℃ during the day and 12 ℃ ~ 15 ℃ at night, not less than 10 ℃. With the continuous growth of melon seedlings, it is necessary to adjust gas and control temperature in time, first, to prevent diseases; second, to avoid plant aging. However, the regulation of temperature must be beneficial to the growth of cucumber. In general, the air temperature rises to 30 ℃ in the daytime, and the greenhouse film is closed when it drops to 28 ℃ in the afternoon. The night temperature during the fruiting period should not be lower than 12 ℃. Strengthen the protection of the greenhouse: first, to keep the ditches around the cucumbers unblocked for timely drainage and irrigation, especially to achieve rapid water filtration; the second is to check whether the greenhouse film is damaged or exposed every day, and pay attention to repair to keep warm and warm; third, cover the grass vine and fix the rope before the strong wind comes to cool down, so as to prevent steep film injury and melon seedlings.