Nowadays, more and more herbicides are mixed. Many people simply think that herbicides are mixed only to save time and effort. In fact, from a scientific point of view, herbicides have the following advantages: First, different mechanisms complement each other to improve the control effect Currently, herbicides widely used in production are mostly selective. The herbicides with different herbicidal spectrums should be mixed and used, and the mechanism of action should be complementary, in order to achieve the purpose of controlling more kinds of weeds. For example, acetochlor can be used in combination with atrazin or sedzin to significantly increase the range of weeding; in the case of rice during the greening period, weeding can only be used to control weeds and cattle grass, such as mixed with dimethyltetrachloride. It can prevent dicotyledonous weeds such as sedge, wild scorpion, etc.; there are many weeds in ramie garden, such as Possina, Wild Mugwort, Poa pratensis, Bermudagrass, etc., with the use of simazine, the weed spectrum is too narrow, For example, if it is mixed with dimethyltetrachloride, 50% of Cimajin 50-60 g and 70% of dimethyltetrachloride are mixed, and 50 kg of water is sprayed. Before the ramie is released, the control effect is very good. Second, the length of the drug is mixed, reducing the number of medications When using herbicides, the herbicide with a long-lasting effect should be mixed with a herbicide with a short-lasting period to complement each other, not only to prevent the weeds in the early stage, but also to basically control the grass in the whole growth period of the crop. Harm . For example, in the cotton field, the use of trifluralin and herbicide ether can generally achieve no cotton damage during the whole growth period of cotton; use 10% rice grass-free wettable powder in rice fields for early post-emergence treatment, which can prevent annual and perennial broadleaf Weeds and sedges, if mixed with 50 grams of butachlor per 667 square meters, can improve the effect of removing mites, and can achieve a single use, the rice field has no grass for the whole season. Third, reduce the amount of mixed drugs, improve the safety of weeding It is possible to avoid herbicide phytotoxicity by adjusting the amount of the herbicide to be used in an amount of less than half of the dose of the herbicide alone. According to the test, 50 grams of bentazon per 667 square meters, used before the branching of piglets, the control effect on weeds such as piglets and Maijiagong can reach more than 95%; 40 grams per 667 square meters, only 46% and 65% for the first two weeds, and 30 grams of bentazon plus 20 grams of dimethyltetrachloride per 667 square meters, the control effect is up to 95 More than %, and the mixed malformed spikes of wheat decreased by 3.2% compared with the monomethyltetrachloride alone. In addition, some herbicides have long residual effects and are likely to have adverse effects on the lower crops. For example, when green granules are used alone, when the amount is more than 300 grams per 667 square meters, it is easy to cause phytotoxicity to crops, and it is very unsafe for the squatting rice. However, if the dosage of chloromeron is halved and mixed with chlorpyrifos, the wheat field can be protected from phytotoxicity and the safety of the sorghum rice can be guaranteed. Fourth, reduce prevention costs and improve economic efficiency When herbicides are mixed, it is necessary to reduce the number of medications and dosage, save labor, and reduce production costs. For example, if the activity of the herbicide is high and it is slightly inappropriate when used, it is easy to cause phytotoxicity to crops, and if the herbicide and methatic chloride Mixed use can overcome their individual weaknesses. It can be mixed before winter wheat 4 leaf stage or spring wheat jointing. The control effect on piglets can be as high as 94%, which is equivalent to the cost of single herbicides, but the cost is reduced. At 22.5%, malformed wheat ears were reduced by 0.85% compared to metformin alone. Reasonable use of herbicides should also inhibit the population change of weeds and reduce the resistance of weeds. At the same time, it is necessary to protect the natural enemies of pests and maintain the balance of agricultural ecology. There are many types of herbicides, so try to pay attention to the above aspects when mixing herbicides, and minimize the harm as much as possible. 1. Before using the herbicide, fully remove the characteristics of the herbicide, and select the appropriate herbicide for mixing according to the purpose of the herbicide. 2. Under normal circumstances, there should be no sputum effect between the mixed herbicides. In some cases, the effect of cockroaches can be used to improve the safety of crops, but the weeding effect should be guaranteed. Third, the mixed herbicides should be physically and chemically compatible, and no physical phenomena such as stratification, crystallization, aggregation and segregation occur, and the active ingredients should not undergo chemical changes. Fourth, the use of synergistic effects between herbicides to increase the activity of weeds, at the same time, will also increase the activity of crops, so care should be taken to prevent phytotoxicity to crops.
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