Spraying pesticides in summer avoids the "four weathers". What are the four weathers?
Summer is a season where many pests and diseases can be seen everywhere, and spraying pesticides is one of the indispensable methods for farmers to manage their fields. However, the temperature in summer is unpredictable and uncertain, and the control effect of pesticides is often endangered by the temperature. Therefore, farmers and friends must pay attention to the weather conditions in winter. Let's take a look at four temperatures that are not suitable for spraying pesticides in summer.
first, windy days: windy days can easily lead to poisoning of spraying workers, so that the sprayed medicine surface or inhalable particles can not be evenly attached to the surface of crops to give full play to the efficacy, and they can also float on the spraying workers, leading to poisoning.
The second is rainy days: pesticides are easy to be lost in rainy days. Spraying pesticides in rainy days can wash away drugs immediately, which not only harms the actual effect, but also continues to cause air pollution in water areas again. Generally, the drugs used for seed dressing are less harmful to precipitation. Because emulsifiable concentrate can be transformed into a layer of floating oil on the surface of green plants, it has certain resistance to further precipitation cleaning, while tablets and wettable powder are the least resistant to precipitation cleaning.
the third day is high temperature: pesticides are easy to cause fertilizer damage at high temperature. High temperature accelerates the melting of pesticides and volatilizes drugs, so high temperature is not suitable for spraying drugs. Moreover, when the temperature is cold, the metabolism of crops is sufficient, and the air holes in leaves are enlarged and opened, so that drugs can easily enter the human body of grain crops and cause fertilizer damage.
the fourth is high and low temperature days: the drug effect is reduced in high and wet days, and the drug is easily diluted by water in high temperature weather with heavy water mist or many dewdrops, which reduces the actual effect of the drug. In addition, the temperature phase is low when the dew is not dry in the morning, and the pests and diseases haven't gone out for the theme activities, so the actual effect of spraying is not good at this time.
In fact, the best time to spray pesticides is 8: -1: in the morning and 5: -7: in the afternoon, which belong to the time range when the sun is not obvious in the morning and evening, which can not only protect pesticides from temperature hazards, but also allow farmers' good friends to work without high temperature. Moreover, it is especially important for farmers to pay attention to the fact that they cannot use river water to mix pesticides, because river water contains minerals such as calcium and magnesium, which is very easy to be reflected with drugs.