How to use chemical weeding to grow corn?

How to use chemical weeding to grow corn? Please introduce that chemical weeding has been widely used in all periods of maize growth. Due to the different climatic characteristics and planting habits in different regions, there are differences in sowing and ploughing time of maize. According to the planting time, corn is usually divided into spring corn and summer corn. For the law of synchronous growth of weeds and maize in spring and summer corn fields, the basic chemical weeding methods are the same, but the main factors to be considered are air temperature, soil quality, maize varieties and farming habits. Reasonable selection of herbicides will not only reduce the labor intensity of farmers, shorten the working time, but also reduce the farming cost and achieve the purpose of increasing production. According to the growing period of corn, chemical weeding in corn field can be divided into three stages: the first stage: the closed treatment was carried out before seedling after corn sowing. In this period, the wheat was harvested or the surface was finished, and there were few or no weeds unearthed. Closed treatment can be used after sowing corn. The main herbicides used are "amide" and "triazobenzene" herbicides, such as the mixture of "Acetochlor", "isopropachlor" and "atrazine". At present, the better herbicides on the market are "cherish jade", "stick rice smile" and so on. Its action mechanism is that through the surface spray, the solution forms a layer of medicinal soil layer with a thickness of one centimeter on the surface of the surface, and meets the medicinal soil layer when the weeds are unearthed and absorbed by young buds or young stems to achieve the purpose of killing weeds. Therefore, when using the above products to control weeds, it is required not to destroy the surface for a long period of time, and walk backward during spraying, so as to spray evenly, otherwise the efficacy may be affected. Pre-seedling weeding in corn field is greatly affected by weather, soil quality, surface conditions, application technology and dosage and other factors, and the efficacy is often unstable. However, the sealing treatment of corn plays a key role in the growth of corn. The ability of crops to compete for fertilizer and water with weeds in the early stage is weak, and it needs a relatively good environment to grow effectively, which can restrict the emergence of weeds to a greater extent and provide a strong guarantee for the control effect of weeds in the later stage. It should be noted that some weeds have been unearthed before the seedlings after corn sowing. At this time, comprehensive weeding can be carried out with "Tianshen" (200g / L water agent), and the unearthed and ununearthed weeds can be controlled. But it should be noted that "Tianshen" should be used immediately after corn sowing. The second stage: if the early treatment of stems and leaves after maize seedlings affects the early use of drugs due to agricultural time or weather, or if the closure is not good due to weather, wheat stubble and other reasons, some weeds unearthed early after maize seedlings can also be chemically controlled. in order to control early field weeds, such as nicosulfuron series products. The specific varieties are "Yunongle", "Jinyulao", "Corn grass killing", "Yuzhi Shield" and so on. At the same time, according to the situation of weeds in the field, they can also be mixed with "Dirong" (chlorofluoropyloxyacetic acid) and other products to expand the weed spectrum to control broad-leaved weeds. Due to the different varieties of weeds in corn field and the different weeds controlled by various herbicides, it is necessary to select suitable varieties of herbicides. For example, nicosulfuron has an ideal effect on aconite and Gramineae weeds, but has a poor effect on broadleaf weeds, while Danglong has a good effect on broad-leaf weeds and a poor effect on Gramineae weeds; therefore, it is necessary to select suitable products to control weeds according to the weeds in the field. First of all, attention should be paid to the safety of drug use when the stems and leaves of maize seedlings are used to spray the whole field. Improper use of drugs after seedlings will appear albino, dwarfing, curling and other drug damage symptoms (first of all, it is necessary to distinguish whether it is caused by diseases and insect pests). The causes of drug damage are generally as follows: first, to increase the amount of medicine; second, to use drugs in high humidity and high temperature environment; third, to mix with other products; fourth, improper time of drug use or the restriction of corn varieties. Take nicosulfuron as an example, the application period is from two to seven leaves after maize seedlings, it can not be used in sweet corn, seed field corn, etc., it can not be mixed with organophosphorus pesticides, and organophosphorus pesticides can not be used within seven days before and after medication. Therefore, when using corn post-seedling products, in addition to detailed consultation with dealers, we should also carefully read the relevant contents of the product labels when using them, so as to use drugs correctly. Compared with closed weeding before seedling, the use of medicine after seedling is less affected by environment, which is the direction of weeding in corn field in the future. In agricultural production practice, the use of post-seedling herbicides can be used along the ridge spray, which is a more mature use technology, our Hansheng company has more successful examples in many parts of the country. The main characteristics are as follows: first, spraying along the ridge after maize seedlings can minimize the damage of herbicides to the more young maize leaves; secondly, weeding is to control weeds growing in the field, if the field is sprayed, the area of corn will be larger, not only a waste of solution, but more importantly, it may reduce the control effect; and ridge application can solve this problem, so as to improve the effect of weeding. The third stage: if the directional treatment before the mid-term closure of corn is due to the unsatisfactory use of drugs in the early stage or the harm of new weeds caused by too much Rain Water, we can still use products such as "Tianshen" or "corn grass killing" and "Jinyu Lao" for directional spraying. At this time, the corn has grown taller (60cm to 80cm). The use of directional spray between rows can protect crops and get rid of all weeds. "Tianshen" (200g / L water agent) is a sterilizing herbicide. Do not spray the product on the crop in application, but add a spray control cover. The main reason affecting the efficacy of "Tianshen" is the cleanliness of the water used in the preparation of the product. In order to improve the efficacy, it is necessary to use pure tap water, do not use water with more impurities, such as river water and well water; under the condition of sufficient sunshine, the "sky flash" is effective quickly, and weeds can be seen to die within a few hours. To sum up, weed control technology in corn field has become an important part of maize planting process. We should try our best to use chemical herbicides to control weeds and reduce the impact of weeds on maize growth to achieve the purpose of increasing production and income. 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