Technical guidance for herbicide application in summer corn field
The use of herbicides must be strictly used in accordance with the instructions. If you use them, you must follow certain time rules. Different application methods are available for different application periods. The following are great considerations for the application of summer corn fields.
1. After harvesting wheat, if there are a lot of weeds in the ground, it is necessary to use a herbicide. Glyphosate is a systemic herbicide that does not show any effect in the early stage after spraying, but in about two weeks, weeds will die from the roots.
Second, the weeds that are unearthed from closed weeds include B-a mixture, Yucaojing and Dua mixture. Generally, 200 grams of preparation per acre and 45 kilograms of water are used. If the amount of water is small, the sealing layer of the agent is thin, and some weeds with strong resistance can easily drill the sealing layer, which makes the control effect poor. However, the amount of water should not be too large, otherwise the effective concentration of pesticides will be reduced and will not be blocked.
3. When the above-mentioned closed herbicides are exposed to cotton, peanuts, soybeans and vegetables, they will produce different degrees of phytotoxicity. Therefore, when spraying the above herbicides, the following principles must be followed: spray as much as possible without wind, and strictly prevent the chemicals from accompanying the wind. Drift to vegetables, peanuts and other crops; spray down the nozzle to minimize the drift of the agent; wear a protective cover in front of the nozzle, directed spray.
4. In recent years, due to the poor effect of using closed herbicides on individual plots, some farmers have grown up such as corn and weeds, and then weeded with herbicides such as Yu Nongle and Yuheng. However, it is necessary to remind farmers' friends that the best period of prevention and control is when the corn is 4 to 5 leaves and the weeds are 3 to 4 leaves. If the corn is treated with 7 leaves, it may cause phytotoxicity.
5. Insect pests in corn fields, pesticides can be mixed with herbicides, but when using herbicides Yu Nongle and Yuheng, they should not be mixed with organophosphorus pesticides to avoid phytotoxicity.
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