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High temperatures in summer can significantly impact the normal growth and development of crops, leading to heat stress and damage. To mitigate these effects, several preventive measures should be implemented. Here are the main strategies:
1. **Cooling with Water**
During hot weather, timely irrigation helps improve the microclimate in the field and lowers the temperature by approximately 1°C to 3°C. This reduces direct damage caused by high temperatures on flowers and photosynthetic organs. Spraying cool water directly onto crop stems and leaves using a sprinkler or sprayer also provides a cooling effect, typically lowering the temperature by about 1°C.
2. **Artificial Pollination Assistance**
In high-temperature and dry conditions, natural pollination for cross-pollinated crops like corn and sorghum may become less effective. By performing artificial pollination, the negative impact of heat on the pollination and fertilization process can be reduced. This method can increase the fruit-setting rate by 5% to 8% compared to natural pollination.
3. **Foliar Fertilization**
During hot seasons, continuous foliar spraying with solutions such as urea, human urine, pig urine, cow urine, potassium dihydrogen phosphate, superphosphate, or grass ash leachate can help both cool and humidify the plants. It also supplies essential nutrients for crop growth. However, it's important to reduce the concentration of the solution and increase water usage to avoid leaf burn.
4. **Enhanced Crop Management**
Proper management of fertilizers and water during hot periods can improve plant nutrition and enhance their resistance to heat stress. For example, sweet peppers treated with a 30 ppm solution of p-chlorophenoxyacetic acid can reduce flower drop caused by high temperatures. Tomatoes sprayed with 2000–3000 ppm B9 solution, 0.1% zinc sulfate, or copper sulfate solution can improve heat tolerance, reduce fruit cracking, and prevent sunburn. Applying 2.4-D to flowers or smearing them can help prevent high-temperature-induced flower drop and promote ovary development. In plastic greenhouses, covering with shade nets during summer can lower temperatures by 4°C to 6°C and protect crops from rainstorms, hail, and pests.
By implementing these strategies, farmers can better manage the challenges posed by summer heat and ensure healthier crop growth.