Cucumbers are remedied after being frozen

Cucumber is a typical thermophilic plant, and its optimum temperature for reproduction is 10°C～32°C. High temperature during the day, about 25 °C ~ 32 °C, 15 °C ~ 18 °C at night, optimum temperature for photosynthesis 25 °C ~ 32 °C. The environment in which cucumbers are located is different, and fertility and temperature are also different.

The lowest temperature for normal growth and development of cucumber is 10°C～12°C. Below 10°C, photosynthesis, respiration, movement of photosynthetic products, and physiological activities such as fertilization can all be affected or even stopped. Cucumber plant tissue is tender, generally -2 °C ~ 0 °C for the freezing temperature. However, the ability of cucumbers to adapt to low temperatures often differs greatly depending on the degree of warming and cooling. Plants that do not exercise at low temperatures will suffer chilling at 5°C to 10°C and freeze to death at 2°C to 3°C.

If chilling and freezing injury occurs during the growth of cucumbers in greenhouses, the following measures should be taken to rescue them:

1. Cut off the dead branches: Cut frozen stems and leaves in time to avoid tissue moldy lesions and induce disease.

2. Artificial water spray: The water spray can increase the air humidity in the shed, stabilize the temperature of the shed, and reduce the amount of evaporated water from the frozen tissue.

3. Ventilation and cooling: When the cucumber is frozen, it cannot be heated immediately by closing the shed. Only the air can be released to reduce the temperature, so that the temperature in the shed can rise slowly, and the sudden increase in temperature can prevent the frozen tissue from necrosis.

4. Irrigation Insulation: Irrigation can increase soil heat capacity, prevent ground temperature from falling, and stabilize near-surface atmospheric temperature. This is conducive to a steady increase in temperature, so that frozen tissue can restore its function.

5. Shed shading: Shed shading in the shed to prevent direct sunlight from the frozen cucumber and reduce the degree of dehydration in the frozen tissue.

6. Make up the fertilization material: After the frozen plants are thawed, apply the available fertilizer. Spray the foliage with 2% urea or 0.2% potassium dihydrogen phosphate solution.

7. Disease prevention: After the plants are frozen, the diseases are easy to take advantage of. Sprinkle some protective pest control agents in time, such as 80% complexed mancozeb 500 times solution, 50% fluocinonide 1000 times solution, 64% import venom scorpion 500 times solution, 50% nellide 500 times solution Wait.

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