Advantages of wheat weeding before winter
â— Weed seedlings are small before winter, with poor drug resistance, low dosage and low cost. The cost of chemical weeding before winter only accounts for 2/3 of the cost of conventional herbicide weeding in spring.
â— 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.
â— For wintering malignant weeds such as swine fever, maiden, and wild oats, the effect of spring prevention is poor, and the effect of pre-worship treatment is good.
â— 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.
â— Pre-winter medication, long safety interval, safe for the next crop; prevent phytotoxicity of adjacent sensitive crops.
Main weeds of wheat before winter
Wild oat seedling
Common grass weeds are: wild oats, maiden, ryegrass, crabgrass, goosegrass, and foxtail.
Broad-leaved weeds are common: sowing sage, pig scorpion, small scorpion, leeks, sorghum, miva cans, blue cabbage, thorny vegetables, small squid and so on.
Introduction of common herbicides:
Gramineous weed herbicide
Methyl disulfuron
It is mainly used to control most malignant grass weeds and some broadleaf grasses 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.
Fluazosulfuron
It is a sulfonylurea 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.
Acetyl ester
It is an aryloxyphenoxypropionic acid herbicide. Mainly used to control wild oats, see Mai Niang, oats, ryegrass, common bluegrass, foxtail and so on. Even in a variety of complex environments such as low temperature, rain, and dry, it is excellent, but the effect is slightly slower.
Isoproturon
It is a systemic soil-treating agent and 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
It 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 weeds, amaranth, alfalfa and bowls are better in control, and the control effect is reduced in successive years.
Thiasulfuron
The systemic selective herbicides are mainly used to control broadleaf weeds in wheat, barley, oat and corn fields of cereal crops. It has poor effect on grass weeds and is ineffective against field spines.
Bensulfuron
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.
Pre-winter herbicide application technology
Application time
1 After the wheat 3 leaves, the weeds are basically out of the same 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 the sunny weather with a temperature above 10 °C. If the temperature is too low (below 6 ° C) when spraying, the weeds die slowly.
Precautions
â— The method of application should be correct. When dispensing, the second dilution method must be used. It is strictly forbidden to pour the medicine directly into the sprayer.
â— 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, it can be selected with fensulfuron + acetylene oxalate or sprayed with phenylsulfofilone.
â— Use a sufficient amount of medicine, water, spray mist, and strive to improve the control effect. Before the application of the drug, the field should maintain a certain humidity to ensure the normal performance 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.
â— 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 paddy fields.
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