The peak season of weeds in summer is in late June, and the growth peak is in July. The summer sowing crops in this period are in the seedling stage, with small roots and weak growth, and the weed density is high and the growth is prosperous. In addition, the rainfall during this period is also high. The weeds often cover the crop seedlings to form grassland and seriously affect the growth of crop seedlings, generally reducing the yield by 20% to 30% and weighing 50 to 60%. Chemical weeding saves time, efficiency and efficiency, but you must pay attention to the following issues to achieve the desired control effect:
1. Herbicides are scientifically selected. The herbicide spectrum of different herbicides is different. At the same time, the resistance of different crops to herbicides varies greatly. Improper use not only results in poor weed control, but also causes phytotoxicity. Different herbicides must be selected for different crops and weed species. , According to the prescribed dose and the best method of application of pesticides in order to achieve the desired results.
2, grasp the appropriate application period. The herbicidal effect of herbicides is related to the period of use, and should be used at the time when weeding is best and the crop is safest. Herbicides have the best effect on weed seedlings (before 3 leaves). The greater the effect the strain has, the worse it will be. Therefore, it is necessary to eliminate early and small, that is, the saying goes, "Grow grass buds instead of weeds the grass."
3, view the surrounding environment. Know the planting conditions of the surrounding crops before use to avoid drift hazards. Should be sprayed in breeze or windless weather.
4, the impact on the crop after the crop. For example: atrazine has a long residual period, and the use time must take into account the arrangement and planting time of the crop.
5, look at the sky, look at the fields, see the crops. Do not apply pesticides before heavy rain, so as to avoid the erosion or accumulation of herbicides caused by rain erosion, resulting in reduced efficacy or phytotoxicity; too dry soil will reduce the effect. Different crops have different resistance to herbicides during different growth periods, such as strong resistance to herbicides at the 2- to 5-leaf stage of the corn, and safe spraying at the top of the leaves, and reduced resistance after 5 leaves. .
6, strictly control the dosage, master the use of concentration and methods. Most of the herbicides are safe to crops at suitable concentrations. They are slightly careless and can easily cause injury. If the dosage is too small, it will not achieve herbicidal action, and it will be too high to produce phytotoxicity. If the soil organic matter content is high and the year of drought, the upper limit of the recommended dosage should be used. Otherwise, the lower limit should be used. When using herbicides, pay special attention to spray evenly, and do not leak or re-spray.
7, spraying equipment. Herbicides should be sprayed with backpack sprayers, preferably fan-type sprayers; the use of motorized sprayers is strictly prohibited.
8, science dilution, pay attention to fight drugs time. Herbicides are diluted twice to increase efficacy. The effect of chemical weeding is closely related to the amount of water used, and the soil is closed: when it is good, the amount of liquid sprayed per acre is not less than 2 barrels of water; when it is poor, it must be no less than 3-4 barrels of water, and it should be retreated when the medicine is sprayed. Do not cultivate in the sky. Post-emergence weeding, mu 1.5 ~ 2 barrels of water. Application time: After 4 pm, it is strictly prohibited to apply drugs before and after noon, and pay attention to the wind direction.
9, pay attention to the interval. With sulfonylurea herbicides such as nicosulfuron, it is important to pay attention to the safety interval of organophosphorus pesticides (7 days) in order to avoid the occurrence of twisting and other injury.
10. Clean the sprayer. The herbicide tank must be washed with water in 2 to 3 times in time to avoid phytotoxicity to the crop during the next use.
Chemical herbicides are influenced by many factors such as the herbicide type, the use period, the used dose, the application range, and the climatic conditions. It is necessary to use the herbicide scientifically and rationally to achieve the best results.
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