High temperature in summer will affect the normal growth and development of crops and cause heat damage. Prevention should be strengthened and its main measures are:
1. Cool down with water. In the hot season, timely irrigation can improve the microclimate conditions in the field and reduce the temperature by 1 °C ~ 3 °C, thus reducing the direct damage of high temperature to crop flowers and photosynthetic organs. Spraying the cool water directly on the stems and leaves of the crop through a sprinkler irrigation facility or a sprayer also has a cooling effect, and the cooling temperature is generally about 1 °C.
2. Artificial assisted pollination. In the high temperature and dry season, the natural loose powder and pollination ability of the crops are reduced. The artificial pollination of the cross-pollinated crops such as corn and sorghum can reduce the influence of high temperature on the pollination and fertilization process of the crop, and the seed setting rate is increased by 5%~8 than the natural pollination. %.
3. Top dressing. In the hot season, foliar spray application is carried out continuously with urea, human urine, pig urine, bovine urine, potassium dihydrogen phosphate solution or superphosphate and grass ash leaching solution, which is beneficial to both cooling and humidification, and can supplement crop growth and development. The water and nutrients needed. However, it must be noted that the spraying concentration must be appropriately reduced to increase the water consumption.
4. Strengthen management. In the hot season, reasonable management of fertilizer and water can improve the nutritional status of plants and enhance their ability to resist high temperature and heat damage. The sweet pepper is sprayed with 30ppm p-chlorophenoxyacetic acid solution, which has certain control effect on the falling flower caused by high temperature; tomato spraying 2000～3000ppmB9 solution, 0.1% zinc sulfate or copper sulfate solution can improve the heat resistance of the plant and enhance Anti-cracking fruit, anti-sunburn ability, using 2.4-D dip flower or flowering, can prevent high temperature drop and promote ovary enlargement; vegetables grown in plastic greenhouse, cover the shade net in summer, the temperature drop can reach 4 °C ~ 6 ° C, and can prevent heavy rain, hail and mites directly harm vegetables.
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