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First, the correct choice of herbicides Each herbicide has a certain spectrum of killing grass, destructive, selective. For example, the gram can kill all the green plants, the wild yoghurt only controls the wild oats, and the jade farm can kill almost all weeds and crops except corn. For example, bensulfuron-methyl and thrips have good effects in controlling broad-leaved weeds and grass weeds in wheat fields, and are safe for wheat. If used in rapeseed or cowpea, they will kill crops. If it is stable, it can only be used in broadleaf crops such as rapeseed, peanuts and soybeans. If it is used in wheat fields, it will cause phytotoxicity. Therefore, it is first necessary to select effective herbicides based on the crop species and the main varieties of weeds. Second, we must choose herbicides according to the farming system. Such as superstars, dimethyltetrachloride, thrips, etc., can be weeded under various planting systems, but chlorsulfuron, metsulfuron-methyl, etc., can only be used in wheat fields under the rice-wheat rotation system, if later, corn, soybeans Wait, there will be different symptoms of phytotoxicity. In addition, pay attention to mixing and alternate use of herbicides. Since the same herbicide has been used continuously for many years, it is easy to cause the sensitive weeds to gradually decrease and the resistance-resistant weeds to rise. Therefore, the herbicides should be mixed and used alternately during the year to achieve the long-term control of grass damage.
Second, choose the best time to apply according to the nature of the herbicide, weed period, weeds and crop growth period, the selected drug is suitable. There are many varieties of herbicides, such as stem and leaf treatment agents, soil treatment agents, contact herbicides, and herbicides. Some are suitable for weeding before germination, and some are suitable for weeding stems and leaves. The soil treatment is to spray the herbicide directly on the soil surface to kill the newly germinated weeds. For example, Duer, acetochlor should be used before the weeds are unearthed after the crops are planted. When the weeds are used after emergence, not only the effect is poor, but also the crops are damaged. Seedling stem and leaf treatment herbicides should be used in the sensitive stage of weeds (before the two-leaf stage) and when the crops are more resistant (after two leaves and one heart). For example, chemical herbicides in wheat field seedlings are used in most grass weeds from the needle-to-two-leaf stage and broad-leaved weeds before the second-leaf stage. For example, when paddy fields are dominated by alfalfa, cattle felt, and dwarf sage, weeding should be applied 4-6 days after planting (weed stage of weeding); if we focus on controlling weeds such as sage, Tianziping, etc. After 10-15 days (weeds are basically out of the same), it is advisable to apply.
How to improve the herbicide effect
In recent years, the promotion and use of chemical herbicides has developed rapidly and is very popular among farmers. However, at present, there are many varieties of herbicides, and the application technology is high. If there is a slight inadvertent application, there will be problems such as phytotoxicity and poor weeding effect. Therefore, how to choose the herbicide variety on the road and master the use of technology is the key to improving the herbicidal effect of herbicides.
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