The corn is not long, bent, and the head is so damaged because the growth point of the corn is damaged, the growth is stagnant, and the stem section of the corn is still elongated. Most of these are caused by improper use of herbicides, and such herbicides such as nicosulfuron and 2,4-D butyl ester are prone to occur. The chemical weeding of cornfield is simple and efficient, and it has been welcomed by farmers. In recent years, the application area has been expanding, but there are also many problems. How to scientifically and reasonably choose and use herbicides ? First of all, it is necessary to select medicines according to local conditions. According to the application timing and weeding principle, cornfield herbicides are divided into two categories: pre-corner herbicide herbicide and corn seedling stem and leaf treatment herbicide. The herbicidal principle of the pre-emergence herbicide is the weed seed which is sprayed evenly on the surface of the soil before the emergence of the corn, before the emergence of the weeds after the emergence of the corn, or before the weeds are in the 3rd leaf stage. Under suitable temperature conditions, it will germinate rapidly after rain or watering. The elongated weed hypocotyls and young shoots will be poisoned once they come into contact with the agents on the surface, and the sprouts will stop or the seedlings will die. Corn seeds are generally distributed under the soil surface of 3 cm. When the soil is sprouted, the hypocotyls will not be exposed to the chemicals under the soil, so they will not be poisoned. Common corn pre-emergence herbicides include acetamidine mixture, butyl hydrazine mixture, isopropyl hydrazine mixture, etc., which have good closed weed control effect on annual broadleaf weeds and grass weeds in corn fields, but for perennial Weeds are invalid. Post-emergence herbicides use the difference in physiological resistance of weeds and corn to pesticides , spraying the agents onto the stems and leaves of weeds to cause poisoning and death. There are enzyme substances in the corn that can decompose the herbicide, so that the drug resistance is good, and the physiological selectivity difference is used to achieve the goal of weeding and strong seedlings. The most widely used corn post-emergence herbicides are nicosulfuron, sulcotrione, 2,4-D butyl ester and metformin. BASF has launched a safer and more effective drug in China in recent years. Pyrazolone herbicide. In view of the herbicidal principles and characteristics of herbicides commonly used in corn fields, spring sowing fields or some summer corn fields in northeast, northwest and Inner Mongolia may use pre-emergence herbicides. If there are perennial weeds in the field, the weeds that have been unearthed can be removed by mixing the gavage with a closed herbicide before sowing. Summer sowing corn fields in North China, Shandong, Henan and other places due to the problem of surface wheat straw coverage, try to choose post-emergence herbicides, post-emergence herbicides have internal absorption of roots on annual grass and some broad-leaved weeds with high efficiency of nicosulfuron. Killing the stems and leaves on the ground is mainly good for the annual broad-leaved weeds. 2,4-D butyl ester and dimethyltetrachloride herbicides have good control effect on most broad-leaved weeds, but they must be strict. Master the timing and dosage. Chloropyroxyacetic acid is used for stem and leaf treatment of a variety of broadleaf weeds, and it is safe and effective. Second, we must strictly follow the technical requirements. In recent years, the reason why cornfield herbicides often have poor efficacy and continuous phytotoxicity is mainly due to the fact that some agricultural resources dealers and farmers often use herbicides as panacea, and of course take the dose to reduce the spray volume. No drugs or medications were strictly selected according to technical requirements. Scientific use of cornfield herbicides is subject to the following three rigor. Strict attitude: Seriously treat and understand the risk and technicality of herbicides, in order to use herbicides to achieve a truly simple and efficient goal. Strict timing: Be sure to read the product description carefully or consult a technician before using it. According to the law of corn growth management and its physiological characteristics, environmental conditions and soil conditions, choose the most appropriate timing. For example, spraying a herbicide with a certain degree of humidity in the soil has the best control effect; the optimum temperature for using post-emergence herbicides such as nicosulfuron is about 25 °C, but it is particularly prone to phytotoxicity when the temperature exceeds 35 °C. . The best time to use 2,4-D and dimethyltetrachloro herbicides is before and after the corn 3 leaf stage and the temperature is above 10 °C. It is easy to cause phytotoxicity when used at low temperature or corn jointing stage. Strict method: Many people want to save energy and increase the dosage of the agent to reduce the amount of spray. This is very wrong. Spray requires that the droplets should be evenly covered on a certain area of ​​soil surface or weed stems and leaves under the premise of a certain degree of fineness, so as to have better control effect. The sprays sprayed by our current spray equipment are relatively thick, requiring about 100 kg of spray to better cover the target on an acre of land. Even if the dosage is increased several times, the amount of the spray is insufficient, and the medicament is not uniformly dispersed. Therefore, the amount of the agent can be mastered according to the product description, but the amount of spray must not be reduced at will. When spraying the herbicides of the nicosulfuron-type seedlings, spraying the ridges and spraying the chemicals directly on the weeds can achieve the goal of labor saving, safety and high efficiency. Only by strictly observing, applying science and technology, and rationally using herbicides can we achieve the goal of safety, simplicity, economy and efficiency. Bestware Sensor Drinking Bubbler Tap brings the fine design and high technology together in all areas of the product process beyond Pull Out Faucet , Commercial Faucet and Commercial Kitchen Faucet. 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