After the cucumbers in greenhouses are introduced in April, the temperature in the greenhouse can sometimes reach as high as 40°C to 50°C, or even higher, as the temperature rises, and the ventilation in the greenhouse is not timely or the ventilation is not smooth. Hazard, the so-called high temperature barrier or greenhouse damage. When raising the seedlings, the temperature of the shed is high, the seedlings will appear leggy, the cotyledons are small, drooping, and sometimes the flowers are topping; the seedlings are exposed to high temperature, the leaves are light in color, the leaves are large and thin, do not stretch, and the internodes grow or become leggy; At the end of the period, the leaves first appeared 1-2 mm in diameter and gradually turned green to ellipsoidal. After 3 to 4 days, the leaves and veins of the entire plant turned yellow-green from top to bottom, especially the upper part of the plant. The performance is obvious, and the plants stop growing when they are serious.
Incidence reasons: greenhouse temperature is higher than 40 °C for a long time, the soil moisture content is low, and the duration is longer. In this case, the growth of plants is accelerated, and it is easy to go crazy. The growth of cucumber is inhibited during the day at 38°C and at night higher than 25°C. Metabolic abnormalities and excessive transpiration of the leaves lead to cell dehydration. Respiration is greater than photosynthetic accumulation, and nutrients stored need to be consumed. The plants are in a state of hunger and show growth disorders. Phenomenon is bound to result in low rate of establishment, easy to melon, fruit drop.
Prevention and control methods: (1) Select heat-resistant varieties. (2) Strengthen ventilation and ventilation, keep the temperature of the shelf below 30 °C, control at about 18 °C at night, and the relative humidity is lower than 85%. In production, even if the doors and windows of the booth are all opened, the temperature is still high. At this time, the bottom of the south side should be lifted to lower the temperature of the shed. At the same time, watering should be taken care of, preferably at 8 to 10 o'clock in the morning. Do not water at night or on cloudy days. Also note that the difference between water temperature and ground temperature should be within 5°C. (3) When the relative humidity of the greenhouse is higher than 85%, it should be ventilated and dehumidified, and the temperature should be 10°C-15°C in the evening, and the ventilation should be 1 to 2 hours to reduce the humidity at night to prevent leggy and avoid high temperature. (4) The first batch of fruit sitting on the production is easy to cause leggy, resulting in a situation of overgrowth. To this end, 100% liquid can be used to protect flowers or flowers, both to promote early maturation and prevent leggy. (5) The use of formula fertilization technology, appropriate application of phosphorus, potassium fertilizer, can also be sprayed multiple complex organic active liquid fertilizer. (6) In case of persistent high temperature or drought, cucumbers in greenhouses will have large evaporation and strong respiration. At this time, the water consumption will be large. If the duration is long, snoring will occur. In this case, the number of watering operations must be increased.
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