For the coming spring, it is a critical period for farmers to use wheat herbicides. Due to improper use in actual operations, there are often two kinds of results: either the poor weed control effect or the susceptibility to phytotoxicity.
At present, the herbicides used in wheat fields mainly include the control of grassy weeds in wheat fields, and the use of oxazolyoxime, clodinafop-propargyl, thimesulfan, methylsulfuron, isoproturon, etc.; Weeds used bensulfuron-methyl, tribenuron-methyl, fluoxypyranoacetate, diflufenachlor, 2-methyl-4-chlorophenol, and the like. The herbicide spectrum of different herbicides is different. For instance, 2 A 4 Cl has good anti-seedling effect on harpy nymphae, leeks, and lacquer, but it has poor efficacy on porcine lice. If the density of weeds in the field is large and there are many grasses and weeds, the soil sealing treatment should be the focus. Green wheat isopropionate, benzimidronone, acetochlor, butachlor, trifluralin and other drugs can be used. . The use of acetochlor and butachlor should pay attention to changes in the weather, rain, water can not be used, the wheat can not be used when germinating to prevent injury, should try to avoid the use of such herbicides.
In the case of wheat seedlings and weak seedlings, the herbicide cannot be used because of the poor resistance of wheat. Waterlogged fields and lowland wheat should be used with caution to avoid phytotoxicity. After the four leaves of wheat till the jointing stage, weeds were used at the 3-5 leaf stage. Both too early and too late will affect weeding and produce phytotoxicity. It should not be used under extreme weather conditions such as freezing, rain and snow, and high winds. The use of oxazolyoxime has stricter requirements. The application of excessive concentration or overdosage of the drug may cause phytotoxicity. Usually, the use of small amounts of water and high concentration of drugs may cause phytotoxicity to crops. Like the phytotoxicity that occurred in the report, if it excludes the quality defects or counterfeiting of the drug itself, it may be due to the influence of local climate conditions. There are many uncertainties in spraying and weeding of stems and leaves. Caused "frozen phytotoxicity" in wheat.
Of course, a slight yellowing after application of wheat is a normal reaction. Don't worry too much. However, due to improper use, resulting in phytotoxicity, yellowing of wheat, and severe stiffness, timely spraying brassinolide, love overdose (sodium nitrophenolate), etc. to promote crop growth regulators to remedy, remedial before jointing, generally There is no major impact on production. Late remediation will affect wheat production.
According to the different treatment methods of wheat fields, different application methods should be adopted. In order to ensure the efficacy of soil sealing treatment, the adsorption capacity of herbicides in soils with high content of clay and organic matter is large, there are few free drugs in soil and water, and the herbicidal effect is weakened, and the dosage should be increased appropriately; while sand soil and sandy loam soil have less adsorption to pesticides. There are many free herbicides in soil and water, and it is easy to exert its efficacy, and the amount should be appropriately reduced. On the other hand, the dry soil and large-grained fields increase soil surface area and increase the adsorption of liquid chemicals. The soil layer is less stable, and soil particles are easily broken when hot and cold are alternately, and weeds will grow again. Appropriate increase in the amount of drugs; moist soil, finely divided fields, drug layer is relatively stable, can reduce the amount of medication. Stem and leaf treatments, when the weather conditions are appropriate, wheat seedlings and weeds are small, and the amount of pesticides can be reduced appropriately; the age of the grass is large, and the amount of medicine to be used should be appropriately increased. This process needs to be taken care to avoid causing phytotoxicity to wheat and after-crop crops. In the blending of pesticides, the preparation of liquid medicine to be diluted twice, to ensure the distribution of pharmaceutical agents in the liquid, and many farmers are now drawing directly into the barrel of liquid medicine. Spraying thoroughly is required, no heavy spray, no leaking spray. Several herbicides should be mixed with reference to the instructions on the label, and they should not be mixed blindly so as to avoid phytotoxicity; nor can they be blindly blended with additives such as silicone, which will increase the penetration of herbicides on crop leaves and produce drugs easily. harm.
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Organic Siberian ginseng extract powder is extracted from the roots, stems, and leaves of Siberian ginseng. Siberian Ginseng or Eleuthero has been used in China for 2000 years as a folk remedy for bronchitis, heart ailments, and rheumatism, and as a tonic to restore vigor, improve general health, restore memory, promote healthy appetite, and increase stamina. Referred to as [Ci Wu Jia" in Chinese medicine, it was used to prevent respiratory tract infections as well as colds and flu. It was also believed to provide energy and vitality. In Russia, eleuthero was originally used by people in the Taiga region of Siberia to increase performance and quality of life and to decrease infections.
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