What are the advantages of chemical weeding in wheat fields? How should this be done?

Chemical weeding in wheat fields is a production-increasing measure that can save time and reduce costs. It has developed rapidly in recent years, suppressing the damage of weeds and promoting grain production. So, what are the advantages of chemical weeding in wheat fields, and how can we improve the effect? 1. Advantages of chemical weeding in wheat fields

There are two methods of weeding in wheat fields: manual weeding and chemical weeding. The advantage of manual weeding is that it does not pollute the environment, but it requires time and energy. Chemical weeding is a new technology that has emerged in recent years. One of its advantages is that it saves labor and time. Compared with manual weeding, the weeding efficiency is increased by 8 to 10 times. Good weeding effect. Generally speaking, the weeding effect is above 95%.

Especially in wheat rows, it has a good control effect on weeds that are difficult to distinguish when mixed with wheat (such as wild oats, sparrows, Zhejiang wheat and other grass weeds). Weeding is less affected by the weather, and drugs applied during the rainy season also have better efficacy. The effect of manual weeding is greatly affected by the weather. Therefore, chemical weeding is very popular among farmers, and the area of ??chemical weeding is expanding year by year. However, improper use of chemical weed control can have many negative effects. 2. Operating principles of chemical weeding in wheat fields

To use herbicides under the premise of safety, the crops to be weeded must first be safe. If herbicides affect crops, you should choose herbicide varieties with short residual effects. They should be used in autumn as much as possible and should not be used in spring to cause adverse effects on marquis crops. In order to improve the weeding effect, the type of herbicide should be selected according to the grass species. Herbicides that kill broadleaf weeds should be used in wheat fields dominated by broadleaf weeds, and herbicides that kill monocotyledonous weeds should be used in wheat fields dominated by monocotyledonous weeds. For wheat fields where broadleaf and monocotyledonous weeds are mixed, a mixture of these two herbicides should be used. Otherwise, the prevention effect will not be good. At present, herbicides that are effective in controlling broadleaf weeds in wheat fields include Guangkuan, Maixi, Longlong, Top Star, 2.4-D butyl and other herbicides, especially 20% herbicides before the four leaves of wheat. No herbicides are used. Most herbicides for wheat fields are applied after 4 leaves. There is no need to use herbicides during the wheat pulling period. Before the four-leaf stage, wheat is relatively fragile, has low detoxification and immunity, and can easily cause weakness. After the lifting period, wheat enters the pregnancy and heading period, which is also the most vulnerable and important period in its life. At this time, it is easy to use herbicides to produce medicinal effects. In particular, 2-methyltetrachloride and 2, 4-titrate sometimes cause wheat ears to be unable to be pulled out or deformed, seriously affecting the final yield. Second, before using organic and carbamate pesticides, do not use herbicides within 7 days.

Do not use herbicides continuously. We all know that it takes 7 days to apply organophosphorus or carbamate pesticides in corn fields. Wheat fields require at least 3-5 days between herbicide applications. Otherwise, the wheat will easily turn yellow. Organophosphorus pesticides reduce the ability of wheat to break down herbicides, so herbicide use can cause weakness.

Use herbicides according to the weather. Although the beginning of spring has passed, "spring cold" often strikes, and low-temperature weather still often occurs. Be sure to watch the weather forecast before the weather begins, and do not use herbicides before the cold wave comes. To avoid causing phytotoxicity and the East China Sea. When the soil moisture is high after rain and the temperature rises, applying pesticides will help improve the control effect. At present, the fields are dry and the humidity in the fields is very low. When talking, sufficient water should be used. Generally, less than 30 kilograms of water per acre should be sprayed evenly and thoughtfully. No more spraying should be done. When spraying the medicine, the temperature should be stable above 8 to 10 degrees Celsius, and the medicine should be applied in sunny and windless weather.

Strictly control the drug dosage, and using too much herbicide will not only have an adverse effect on the wheat, but sometimes also the marquis crop. If the dose of herbicide is too low, it will not be effective in controlling weeds and will not be able to kill weeds and protect wheat. The herbicide should be used strictly and at the recommended dose.

In short, chemical weeding has many advantages, but it must be used scientifically to maximize its effect.