1 What should I pay attention to when weeding wheat? 1 Wheat 4 leaves or 4 leaves 1 heart period, more tolerant to herbicides , herbicides are safest after 4 leaves, in addition, most of the weeds have been released at the 4th leaf stage of wheat, and the grass age is relatively small. Wheat has no tillers, and there are not many leaves. It is easier to kill weeds. At this time, herbicides are most effective. 2 Strictly control the temperature. Herbicides are generally labeled at 2 ° C or can be used at 5 ° C. So what is the temperature at 2 ° C and 5 ° C, which is the temperature at the time of use or the lowest temperature? The answer is the latter, here The temperature refers to the lowest temperature, that is, the lowest temperature can be used above 2 ° C, and the temperature should not be lower than the temperature before and after the herbicide. 3 It is forbidden to use medicine on windy days. It is easy to cause the herbicide to drift when it is used in windy days. If the effect is not good, it may also cause herbicide damage caused by greenhouse crops or other crops. Therefore, it is necessary to pay attention to the prohibition of medication on windy days. 4 Do not use drugs in bad weather. It is forbidden to use herbicides in bad weather such as frost, rain, snow, hail, cold current, etc. It is also necessary to pay attention to the bad weather before and after herbicides. Farmers must pay attention to the weather forecast. 5 Do not use herbicides when the wheat seedlings are weak and the roots are bare. Generally, wheat fields will be returned to the field, and the land will be loose. If there is an abnormal weather, such as a warm winter drought year, it must be noted that the root system of wheat may be too loose due to the soil being too loose, or part of the roots may be exposed. Wheat is easy to cause frostbite and water shortage. Such wheat seedlings are the most sensitive and fragile. If herbicides are used at this time, it will cause some damage to wheat. 6 Do not use herbicides when wheat is sick. In recent years, wheat sheath blight, root rot, total eclipse and other species or soil-borne diseases frequently occur. Before using herbicides, determine whether your own wheat seedlings are sick. If it is sick wheat, it is best not to use herbicides. 7 Be sure to take a second dilution with the herbicide. Some farmers plan to save the herbicide directly into the sprayer, just find a branch and stir it. This method of redemption is very unscientific. Because most herbicide products carry their own auxiliaries, the auxiliaries act as osmotic synergists. They are usually viscous. If they are poured directly into the sprayer, they may sink to the bottom of the bucket. If not fully stirred, it may cause help. The herbicide can not be opened, which may lead to two kinds of consequences. One is that the drugs are all finished, and some of the herbicides are still not opened at the bottom of the barrel, causing waste; another consequence is that they just started playing. The herbicide in the wheat field is very light, and the herbicide that is finally hit is very heavy. Therefore, the use of herbicides must pay attention to the second dilution. 8 Herbicides must be used strictly in accordance with the regulations, to avoid excessive use, some farmers friends will spray a few times in the thick grass when hitting the herbicide, or afraid to waste the last remaining herbicide hit the last plot This method is very easy to cause herbicide phytotoxicity, because the herbicide is safe for wheat at normal use concentration, but if it is used excessively, the wheat itself cannot be broken down, which will cause damage to the wheat. 9 Correctly treat the phenomenon of yellowing seedlings of herbicides. After some herbicides are used, wheat will have a short yellow tip, which is a normal seedling phenomenon. It usually recovers when the wheat is green. This phenomenon will not cause the production to decrease, but will increase the yield of wheat. It can prevent wheat from affecting its reproductive growth due to excessive nutrient growth, so farmers do not have to worry about this phenomenon. 2 What time is best for weeding? The best control period for weeds in wheat fields is wheat tiller before winter and early stage of wheat jointing. But in general, wheat is weeded before winter, and the effect is better! Advantages of wheat weeding before winter: 1 The weed seedlings are small before winter, the drug resistance is poor, the dosage is small, and the cost is low. The cost of chemical weeding before winter only accounts for 2/3 of the cost of conventional herbicide weeding in spring. 2 Before applying the medicine, the wheat seedlings are not sealed, the field canopy is small, the weeds are bare, the medicine surface is large, and the control effect is good. 3 For the wintering malignant weeds such as piglets, maiden, and wild oats, the effect of spring prevention and treatment is poor, and the effect of treatment before winter is good. 4 Overwintering weeds fall and wheat are unearthed at the same time, competing for nutrients. Weeding before winter can ensure that wheat absorbs more nutrients, which is good for winter wheat to form strong seedlings and increase yield. 5 Pre-winter medication, long safety interval, safe for the next crop; can prevent phytotoxicity of adjacent sensitive crops. Main weeds of wheat before winter: Common weeds of wild oat seedlings, wild oats, maiden, ryegrass, crabgrass, goosegrass, foxtail, etc.; common weeds of broadleaf weeds , pork chop, small clams, leeks, oysters, rice pots, blue cabbage, thorny vegetables, small convolvulus and so on. 3 How to choose wheat herbicide? Gramineous weed herbicide Methyl disulfuron is mainly used to control most malignant grass weeds and some broad-leaved weeds in wheat fields. The drug has a short residual effect in the soil and does not affect the growth of the lower crop. However, the cost is high and the medication technology is strict. It is recommended to use it before winter. Fluazosulfone is a sulfonylurea herbicide. It can effectively prevent grass weeds in wheat fields and has special effects on buckwheat; however, the drug has a poor control effect on wheat. Vinyl oxalate is an aryloxyphenoxypropionic acid herbicide. Mainly used to control wild oats, see Mai Niang, oats, ryegrass, common bluegrass, foxtail and so on. Even in many complicated environments such as low temperature, rainy, and dry, it is excellent, but the effect is slightly slower. Isoproturon is a systemic treatment agent for internal aspiration and a stem and leaf treatment agent. After the drug is absorbed by the roots of the plant, it is instructed and accumulated in the leaves to inhibit photosynthesis and cause weeds to die. Isoproturon has good safety to wheat, but it will reduce the anti-freezing ability of wheat seedlings. Broadleaf weed herbicide Bensulfuron is mainly used to control broadleaf weeds in wheat crop fields. It is safe, has a wide spectrum of herbicides, has a long application period, is less affected by the environment, and has low cost. In the weed community, the weeds with the advantage of wheat malt, amaranth, alfalfa and bowl of flowers are better in control, and the control effect is reduced in successive years. Thiasulfuron is a systemic selective herbicide for endocrine conduction, mainly used to control broadleaf weeds in wheat, barley, oat and corn fields. It has poor effect on grass weeds and is ineffective against field spines. Bensulfuron-methyl is a selective systemic herbicide that is absorbed and transferred to various parts by weed roots and leaves, and is safe for crops such as wheat and rice. The effect below 0 °C is poor, the speed of dead grass is slow, and the soil must be moist when used in wheat fields. If the soil is dry, the control effect is low. 4 application time 1 After the wheat 3 leaves, the weeds are basically out and the tissue is fine and the spraying effect is the best. Generally, it is suitable to use medicine in the middle of November, about 40 days after sowing of wheat. At this time, the amount of weeds is more than 90% of the whole growth period. 2 In order to ensure the control effect, it is necessary to use the medicine when the soil is relatively moist in sunny weather with a temperature above 10 °C. If the temperature is too low (below 6 ° C) when spraying, the weeds die slowly. 5 Notes 1 The method of application should be correct. When dispensing, it is necessary to use the second dilution method. It is strictly forbidden to pour the medicine directly into the sprayer. 2 The choice of the drug should be treated differently according to the situation of the wheat field. If it is a grassy and broadleaf weed mixed wheat field, you can use fensulfuron/methyl disulfuron + acetylene ester or spray benzene sulfonate. . 3 It is necessary to use a sufficient amount of medicine, water, and spray mist to improve the control effect. Before the application of the medicine, a certain humidity should be maintained in the field to ensure the normal effect of the drug. It is best to seize the favorable timing after the rain, and the fields with severe drought should be flooded, drought-resistant and drained, and then treated with drugs. 4 Ensure safe medication. Master the medicine when you are warm-headed and have no water in the field to avoid phytotoxicity. It is best to use the medicine at noon on a sunny day. Isoproterenol should not be used during cold spells or in low-lying waterlogged fields. More pesticide knowledge , please pay attention to China Pesticide Network Suzhou Newstar Hardware Co.,Ltd is China good manufacturer for Hand Tools In Blow Case, Tool Set With Blow Case. We are a reliable supplier and partner offer you good price, high quality Hand tools in different kinds of packages. Hand tools in Blow Case Kit, Blow Molded Tool Case and other kinds of packages like Trolley, Cabinet, Bag and Blister. Any requirements on tools please contact us. Hand Tools In Blow Case,Tool Set With Blow Case,Hand Tools In Blow Case Kit,Blow Molded Tool Case SUZHOU NEWSTAR HARDWARE CO.,LTD. , https://www.sjnewstarhardware.com