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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 the agent will be reduced, and the sealing effect will not be achieved.
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.
Note on the use of herbicides in summer corn fields
Summer corn often encounters hot and rainy weather during the growing season. There are many types of weeds in the field, and the growth rate is fast. The grass damage directly affects the yield and benefit of corn. The use of chemical weeding effect is good and effective. However, there are many varieties of corn herbicides, and the use of high technical requirements can cause phytotoxicity to corn. For the use of herbicides in summer corn fields, the following should be noted:
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