How to remove the most effective corn
On June 7, the farmers sprayed herbicides in the corn fields of Jiazhai Town, Luanping County, Liaocheng City, Shandong Province. Zhao Yuguo, director of the subject Liu Niantu Editor's note At the present wheat harvest period, the planting of summer maize is also carried out immediately, and the arrival of the hot and rainy season is conducive to the growth of weeds in the field. Once the suitable period of prevention and control is missed, it is easy to form grass damage, which seriously affects the quality and yield of corn. Today, this edition features a set of manuscripts that are expected to help agricultural producers. 1 method chooses depending on the situation Soil sealing treatment The soil sealing treatment is the commonly used method of weeding corn field. It is very convenient to use in the process of corn seedlings before seeding. However, the application of closed weeding has high requirements for soil moisture, so we must ensure good herbicidal effect. It is generally necessary to take certain water replenishment measures. After the emergence of corn, the treatment of stems and leaves is not strict with soil moisture requirements, but the control period is short and the technical requirements are high. Therefore, in the production should be based on the principle of good control effect, water conservation and time and labor, scientific selection of weeding methods. After the summer maize is planted, the rainfall is more, the soil moisture is good, and the soil is recommended to be weeded. Stem and leaf weeding If the rainfall is less, the soil moisture is poor, it is recommended to weed the stems and leaves. In the selection of herbicides, it is recommended to use 40% Yujing (B. sputum) suspension agent 300 ml / mu or 40% isopropyl sulphate suspension 200 ml / mu; 40 g / liter for stem and leaf treatment Yujingxiang (nisnisulfuron) dispersible oil suspension agent 40 ml / acre + 38% atrazine suspension agent 70 ml / acre. As long as the scientific and reasonable timely and appropriate amount of prevention and control, both methods of weeding can achieve better control effects. Beijing Zhibao Station Yuelu Yuan Zhiqiang Dong Jie 2 pre-emergence seedlings If the herbicide is poor in the sowing period of the pre-emergence weeding summer corn, when the herbicide is selected before the seeding of the corn, the herbicide which can absorb the roots, stems and leaves and kill the larger weeds should be used as much as possible. Whenever possible, increase the amount of water so that the agent can be sprayed onto the soil surface. You can choose Yufengbao (isopropylate + atrazine), Yu Nongxi (acetochlor + atrazine) compound herbicide. The herbicides are mainly absorbed by buds, roots, stems and leaves, which can effectively prevent annual grass weeds and broadleaf weeds, not only have better closed weeding effect, but also have better effects on weed control. . Post-emergence weeding 3~5 leaf stage is an important period for weed control in corn fields. If weeds are not timely prevented, it will directly affect the growth and yield of corn. For the soil moisture is better, the field is flat, the herbicide has not been applied before or the herbicide has been applied for a short period of time. The main weeds in the field are corn fields such as crabgrass, foxtail, alfalfa and anti-twig, which can be in corn 3~5. After the seedling stage, the post-emergence stem and leaf treatment agent paraquat and Jinyucheng were applied. When applying the drug, it is necessary to pay attention to the application of the drug during the 5-leaf stage of the corn. It is easy to cause phytotoxicity after the application of the 5-leaf stage of the corn, and it is easy to cause phytotoxicity if the high temperature is applied during the application. For corn fields with long-term application of closed herbicides such as acetaminophen, in the 3~5 leaf stage of maize, when a large number of fields of aconite and glutinous rice are found in the field, the post-emergence stem and leaf treatment agent can be used for uniform spraying. When the application is uneven or the dosage is large, the corn leaves have a small amount of yellow spots, which can be recovered in a short time, and generally does not affect the growth and yield of the corn. After the application of the 5 leaf stage of corn, the liquid should not be allowed to flow into the corn bell mouth, and it is necessary to spray it in a targeted manner, otherwise it is prone to phytotoxicity. Tongren 3 chemical weeding prevention error zone Summer corn is caused by weeds and management difficulties due to improper use of herbicides, resulting in lost work, wrong time, and reduced corn production. Based on the problems and relevant experiences of farmers, the author summarizes how to rationally use cornfield herbicides. Inappropriate application period The types of herbicides used in summer corn field mainly include herbicides on the closed ground of corn seedlings and herbicides after corn seedlings. The spraying time of different types of herbicides is different. For example, a closed herbicide is required to be used in front of corn seedlings, and it is less effective when the weeds are unearthed or when the grass is slightly older. The stem and leaf treatment herbicides are required to be used in the 3 to 5 leaf stage of weeds, and the effect of excessive grass age is not good. Unreasonable dosage and application methods mainly include inaccurate dosage, uneven spraying, heavy spray or leak spray, and no secondary dilution required for secondary dilution, often resulting in poor herbicidal effect or phytotoxicity. The low water consumption is not used according to the herbicide instructions, and it is often only a matter of saving, only one sprayer water per acre. The low water content can not ensure uniform application and penetration, and the soil can not form enough sealing film after the treatment, resulting in weeds. Poor soil preparation quality The soil needs to be leveled when the soil is closed. Otherwise, the uniform and strict soil layer cannot be formed after application, resulting in poor drug effect and causing weeds. Especially after the wheat straw is returned to the field, it is necessary to remove the excess straw to avoid the poor control effect caused by direct spraying. Regardless of soil conditions, in general, sandy soils use less viscous soils, and poorer soils use less fertile soils. When farmers use drugs, they often do not consider these factors. Regardless of the soil or clay, regardless of the abundance of organic matter, a dose is used, resulting in more soil and organic soil rich in weeds, and less sand and organic matter. Meteorological factors Because the season of using herbicides in summer corn fields is the hot rainy season from late June to early July, temperature and rainfall are two important factors that affect the efficacy of the drug. First, high temperature and low humidity can destroy the closed herbicide to form a drug film. Secondly, rainfall affects the absorption of herbicides by weeds, resulting in poor pharmaceutical effects. Response measures 1. Use according to the herbicide instructions, strict use period. For example, the post-emergence herbicide nicosulfuron should be used before the visible leaves of the corn to the leaves of the visible leaves. If the drug is used in the 5-7 leaf stage, it should be used between the corn rows. It is not allowed to spray the whole field to prevent the liquid from being sprayed into the heart leaf, otherwise it may cause phytotoxicity. 2. Strict dosage, sufficient water. The constant spray is carried out according to the prescribed dosage. If the “second dilution method†is used, the mother liquid is first formulated, and then evenly sprayed with water. Use enough water and spray thoroughly to penetrate. When using a closed herbicide, it should be carried backwards to avoid breaking the film and affecting the weeding effect. 3. Pay attention to the cleaning sprayer. Some post-emergence herbicides cannot be mixed with organophosphorus pesticides, otherwise they may become phytotoxic. 4. According to the recent weather forecast, timely and appropriate medication, improve the quality of medication. Avoid spraying before heavy rain. The effect of medication is good before 9:00 am and after 4:00 pm. Continue to use high temperature to avoid medication. The temperature is more than 35 °C. In addition, the wind is disabled when the wind is large, so as to prevent the liquid from drifting to other crops and causing phytotoxicity. This article URL: how corn is most effective in weeding Beard Straight Comb,Straight Beard Comb,Men Hair Straightening Comb,Electric Straight Hair Beard Comb Shenzhen Jie Zhong Lian Investment Co., Ltd. , https://www.szmeizons.com