First, dry hot air two types
1, high temperature and low humidity type
The maximum daily temperature is usually 32 degrees, the highest can reach 37-39 degrees; the relative humidity of the air will drop to 25%, resulting in enhanced plant transpiration, reduced water absorption capacity, physiological dysfunction, and plant wilting or dry death in severe cases.
2, after the rain
After the rain, it suddenly turned clear, the temperature rose and accompanied by a certain wind, the plant transpiration increased, and the plants quickly dehydrated, leading to the death of green or green.
Second, the harm of dry hot air
Dry hot air is more harmful to open-air vegetables, which will cause the leaves to dry and grow slowly, which will cause the plants to die dry. The vegetables in the greenhouse are relatively less affected by dry and hot winds, but the vegetables near the air outlet are easy to dry. The danger of hot air.
Third, the prevention of dry hot air
1. Watering in time to increase humidity
Pay more attention to the weather forecast, watering the whole field 2-3 days before the oncoming hot air, reduce the near surface temperature and increase the humidity in the field; avoid watering in the hot weather and sunny days at noon; take the principle of small water pouring when watering.
2, laying the cover to reduce water loss
Covering the straw, rice husk, etc. on the plant surface can avoid exposure of exposed plants, reduce water loss, reduce soil temperature, promote root growth and increase plant resistance.
3, slowly uncover the film ventilation
More open the shed film on both sides of the arch shed and the shed film ventilation in the front of the greenhouse. It should be noted that when the dry hot air comes out, the film is prematurely exposed or too strong, which may lead to whitening and dry edges of the vegetables.
4. Spray foliar fertilizer to improve plant resilience
Before the occurrence of dry hot air, foliar application of full-nutrient foliar fertilizer or amino acid, chitin foliar fertilizer for foliar application to improve the plant's ability to resist dry heat; regular spraying of alizarin lactone and other growth regulators To regulate plant growth and improve resilience.
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