In the cold winter and spring season, many vegetable farmers choose to spray pesticides at noon to prevent pests and diseases. It is generally believed that under the irradiation of noon sunlight, the sprayed liquid will dry faster and penetrate into the leaves better, thus improving the medicine. effect. But pay attention to avoid common misunderstandings. For example, spraying at noon is a common mistake.
In winter and spring, the temperature in the shed is low, and after dew leaves in the morning, the photosynthesis gradually enters the peak period. Spraying will inevitably reduce the temperature in the shed and affect the photosynthetic efficiency. Whether in winter or spring, summer or autumn, medication should be avoided at noon on sunny days. Because the high temperature at noon on the sunny day facilitates the decomposition of the drug and the volatilization of water in the liquid, the chemical activity of the drug becomes stronger when the weather is hotter, and the toxicity of the pesticide also becomes relatively large.
In the cold season of winter and spring, the pesticide spraying time was controlled from 2:30 to 3:30. If you encounter continuous sunny weather, the temperature inside the shed is high, you can also spray after 4 pm, the same can play a very good sterilization effect.
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