With the widespread use of chemical herbicides and the evolution of weed communities, it has been difficult to control a variety of mixed weeds with a single herbicide. Therefore, the mixed use of herbicides has attracted more and more attention. However, the mixed herbicide is not a simple random mix, but should meet the following five basic requirements:
I. Expanding the range of weeding and improving the control effect At present, most herbicides widely used in production are 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 sekzin to significantly expand 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, mixed with dimethyltetrachloride, that is, 50% of Cimajin 50-60 g and 70% of dimethyltetrachloride, sprayed with 50 kg of water, and applied before ramie emergence, the control effect is very good.
Second, extend the herbicidal aging, reduce the number of medications when using herbicides, the long-lasting herbicide should be mixed with the short-lived herbicide to play a complementary role, not only can prevent the weeds in the early stage, but also It can basically control the grass damage in the whole growth period of the crop. 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 phytotoxicity, improve the safety of weeding, adapt to the use of mixed herbicides, usually less than half of the use of herbicides alone, can avoid herbicide phytotoxicity. 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 the cost of prevention and control, improve the economic benefits of herbicides mixed, should reduce the number of medications and medications, save labor, reduce production costs, such as high activity of herbicides, a little improper use, it is easy to cause damage to crops, If the herbicide is mixed with metformin, it can overcome its single weakness. It can be mixed before the winter wheat 4 leaf stage or spring wheat jointing. The control effect on the piglet can be as high as 94% or more. The cost of the herbicides is comparable, but the cost has dropped by 22.5%. Compared with the monomethyltetrachloride alone, the malformed wheat ear has decreased by 0.85%.
5. Suppressing population changes, maintaining ecological balance and rational use of herbicides, it should also inhibit the change of weed population 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.
I. Expanding the range of weeding and improving the control effect At present, most herbicides widely used in production are 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 sekzin to significantly expand 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, mixed with dimethyltetrachloride, that is, 50% of Cimajin 50-60 g and 70% of dimethyltetrachloride, sprayed with 50 kg of water, and applied before ramie emergence, the control effect is very good.
Second, extend the herbicidal aging, reduce the number of medications when using herbicides, the long-lasting herbicide should be mixed with the short-lived herbicide to play a complementary role, not only can prevent the weeds in the early stage, but also It can basically control the grass damage in the whole growth period of the crop. 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 phytotoxicity, improve the safety of weeding, adapt to the use of mixed herbicides, usually less than half of the use of herbicides alone, can avoid herbicide phytotoxicity. 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 the cost of prevention and control, improve the economic benefits of herbicides mixed, should reduce the number of medications and medications, save labor, reduce production costs, such as high activity of herbicides, a little improper use, it is easy to cause damage to crops, If the herbicide is mixed with metformin, it can overcome its single weakness. It can be mixed before the winter wheat 4 leaf stage or spring wheat jointing. The control effect on the piglet can be as high as 94% or more. The cost of the herbicides is comparable, but the cost has dropped by 22.5%. Compared with the monomethyltetrachloride alone, the malformed wheat ear has decreased by 0.85%.
5. Suppressing population changes, maintaining ecological balance and rational use of herbicides, it should also inhibit the change of weed population 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.
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