Liu Xianping was a young intellectual who returned to Liuhe Bay, Chenzhai Village, Tiancheng Town, Yingcheng City. He wrote that some of them had killed some weeds after applying some chemical herbicides on crops. Bad consequences, I do not know why? I do not know how to apply correctly? When using chemical herbicides, we must pay attention to where the problem is. With the continuous application of modern agricultural science and technology, more and more farmers are applying herbicides to crops. In accordance with the operating procedures, it can receive the effect of provincial production and income increase, and the illegal operation has some negative effects. Some kill the weeds, but they also kill the crops; some directly produce crop damage to the crops; some remain in the soil and cause damage to the crops. First, choose herbicide varieties and brands. There are many types of herbicides, such as stem and leaf treatment agents, soil treatment agents, contact-killing herbicides, and herbicides. Some of them are suitable for pre-emergence weed control and others are suitable for weed control of stems and leaves. Although some of the same species, but different manufacturers, different brands, different quality, we must choose the famous brand, excellent quality, complete procedures of the species, do not want to buy cheaper brands of shoddy goods. Second, choose a good ecological conditions. The same herbicides have different effects due to different ecological conditions at the time of application. For example, when the herbicides such as trifluralin and ditertabine that are sensitive to light are used for soil treatment prior to sowing, they must be covered with enamel while applying the pesticide. Otherwise, the herbicides can easily be volatilized by the photolysis and reduce the herbicidal effect. In addition, the herbicides such as Gore have good photosynthetic performance, and the more effective the light is, the more effective the herbicide is. Some herbicides have strict temperature requirements, and they produce phytotoxicity at high and low temperatures. The optimum temperature effect is best. Dryland herbicides are also very demanding on the temperature, and the effect of soil moisture deficiency is not good. The production needs to be applied skillfully according to the requirements of different herbicides on ecological conditions in order to fully realize the comprehensive effect. Third, distinguish weeds selected herbicides. The more monocotyledonous weeds should be selected to kill monocotyledonous herbicides. Dicotyledonous weeds should be selected to kill herbicides dominated by dicotyledonous weeds. In the field where two types of weeds are mixed, herbicides capable of killing mixed weeds should be selected. However, it should only be applied during the pre-crop and weed initiation stages. These types of herbicides must not be applied upside down, as they would accidentally injure crops. Fourth, use auxiliary measures to improve control efficiency. The vitality of weeds is very strong. In order to expand the effect of consolidating and killing the grass, we should pay attention to the use of supplementary measures to improve the control effect. One is to get rid of the early, except for small; the second is to shovel weeds around the field; third, deep plowing to remove perennial deep-rooted weeds; four to diligent cultivator to eliminate the missed weeds.
Medical airways are medical devices used to maintain an open airway in patients who are unable to breathe on their own. It is typically made of soft, flexible materials such as PVC or medical grade plastic, and is designed to be inserted into the patient's mouth and throat to prevent obstruction of the airway. Disposable medical airways are single-use devices that are discarded after each use to prevent the spread of infection. They are commonly used in emergency situations, during surgery, and in other medical procedures where maintaining a clear airway is crucial.
Oropharyngeal airway, nasopharyngeal airway, guedel airway, respiratory airway
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