Practice has proved that autumnal treatment of “wheatgrass†can significantly improve control efficiency. Not only is the amount of the drug used less, but weeds are also dying fast. It can be said that “wheatgrass†is an autumnal disease that does more with less. First, the characteristics of changes in the type of weeds in wheat fields In recent years, due to the reasons of cross-regional wheat harvesting, seed allocation, and long-term single use of tribenuron-methyl, most of the weed populations in wheat fields have undergone changes, and more and more vicious weed species have occurred. The scope is getting bigger and bigger. Among them, weeds such as grassy weeds, barley, wild oats, Japanese weevil and broadleaf weeds, and cattle weevil have become new vicious weeds in wheat fields in Hebei Province. Herbicides such as sowed wormwood and leeks have different degrees of resistance to tribenuron-methyl. Tribulus terrestris, peony flowers, spiny vegetables, etc. have risen from secondary weeds to main weeds in some areas. Second, the "grass" autumn governance of the technical points 1. According to the main weed species in the field, choose the corresponding herbicide species. (1) For wheat fields dominated by broad-leaved weeds such as Sophora japonica L. and leeks, 10% tribenuron-methyl wettable powder can be used for 10 g/mu and 56% powdered sodium tetramethoate for 100 g/mu, or 72% of 2,4-D butyl ester emulsifiable concentrate 50 ml per mu, or 40% fenacenone water dispersible granules 4 g per mu. (2) In wheat fields dominated by broad-leaved weeds and hog hooves, 4 to 5 grams of water-dispersible granules of 40% fluvazone may be used, or 60 to 70 ml of 20% chlorofluoroacetic acid may be used. Or 58g/L of Fluvaxime + Flumeflufenicol Suspension (trade name: Maixi) 10ml/mu, or 495g/L Suflufenacil + dimethyltetrachloroisocyanate Suspension (Product Name: Maishida) 30-40 ml per mu, or 6.25% amidosulfuron + methyl iodosulfuron sodium salt dispersible granules (trade name: so as to be high) 10-20 grams per acre. (3) Wheat fields dominated by gramineous weeds, such as wheat, can use 3% methylsulfuron oil suspension (trade name: Shima) 20-35 ml per mu, or 3.6% methyl iodosulfuron-methyl The sodium salt methylsulfuron-water dispersible granules (trade name: Komamax) is 15 to 25 grams per mu. (4) Wheat field dominated by Gramineous weeds and broom wheat, 70% chlorazuron-methyl water dispersible granules (commodity name: tigris tiger), or 3% methylsulfuron-methyl oil suspension (trade name: Shima) 20 to 35 ml per mu, or 3.6% methylsulphosulfuron sodium methylsulfuron water dispersible granules (commodity name: Komamax) 15 to 25 grams per mu, plus special additives . Or 7.5% tioxaprine water dispersible granules (trade name: priority) 9.3 to 12.5 g per mu. (5) In wheat fields dominated by grass weeds such as wild oats and Japanese amalines, the use of 6.9% fenoxazole herb water emulsion 70 ml per mu, or 15% clodinafop-propellant wettable powder (trade name: Maiji) 20-30 grams per mu, or 3% methylsulfuron oil suspension (trade name: Shima) 20-35 ml per mu, or 7.5% tioxaprine water dispersible granules (trade name: Priority) 9.3 to 12.5 grams per mu. 2. Grasp the control period. More than 90% of the weeds in wheat fields emerge in the fall. At this time, the weeds are young, the leaves are young, and the drug resistance is weak. At this time, the use of drugs can increase the control effect, reduce the dosage, and increase the yield of wheat and post-crop crops. safety. The appropriate period of application is generally controlled from late October to early November. After the wheat is delivered, the weeds have a period of 2 to 4 leaves. 3. Use of herbicides. (1) Secondary dilution method. As the amount of the currently used medicaments is small, and most of them are suspensions and solid preparations, it is not easy to dissolve them even when they are directly added to the sprayer. Therefore, it is recommended to use the secondary dilution method. This method has been verified during the use of tribenuron. First, the drug is fully dissolved with a small amount of water, and then added to the pail according to the dose. (2) The dosage should be calculated according to the land area, and it cannot be increased or decreased arbitrarily. The spray should be uniform to avoid re-spray or spray. (3) Knapsack sprayers, suitable for 30 kilograms per acre, it is recommended to use fan-shaped sprinklers. (4) Choose sunny and windless weather during spraying, and apply the maximum temperature of 10°C or above during the day and the minimum temperature not less than 5°C. If the weather forecast has a significant temperature drop in recent days, the application of pesticides is prohibited. (5) Do not arbitrarily mix the herbicides, and do not mix them with other pesticides at will, so as not to reduce the efficacy or produce phytotoxicity. The labeling of each product shall prevail, or a small area test shall be conducted first. Disposable Ear Loop Face Mask,Folding KN95 Mouth Mask,Anti-pollution Disposable Face Mask,3D Kn95 Face Mask Dongguan Keyutai Mask Co., Ltd. , https://www.maskkytai.com