Winter and spring vegetables fight medicine to avoid noon
2021-01-15 12:20:41
In the cold winter and spring season, many vegetable farmers choose to spray pesticides and pests at noon, because it is widely believed that under the irradiation of noon sunlight, the sprayed liquid will dry faster and penetrate better into the leaves, thus increasing Medication effect. In fact, this idea is wrong. Whether in winter or spring, summer or autumn, you should avoid using medication in 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. Especially when sprayed with emulsifiable concentrate and various herbicides at high temperatures, it is very prone to phytotoxicity and pesticide poisoning. In the cold season of winter and spring, the spraying time of pesticides is from 2:30 to 3:30 in the afternoon, and it is best not to use drugs in the morning. Because the temperature in the shed during the winter and spring seasons is low, dew retreats in the morning, and photosynthesis gradually enters the peak. Spraying will inevitably affect the increase of temperature and reduce the photosynthetic efficiency. The afternoon medication will not affect the temperature, which is conducive to the prevention of diseases and insect pests. If the continuous sunny weather in winter and spring, the temperature within the shed is higher, it can also be sprayed after 4 pm, which can also play a very good sterilization effect.
SICHUAN UNIWELL BIOTECHNOLOGY CO.,LTD. , https://www.uniwellbio.com