Wheat chemical weeding grasp three standards
Time finding
After the beginning of spring, the day is getting longer, the temperature gradually rises, wheat and weeds grow rapidly, and it is necessary to grab early and quickly use drugs. Remind farmers to ensure that the chemical control of wheat is carried out before 9 o'clock in the afternoon, when the weather is fine. Special attention should be paid to avoiding rainy weather. After the beginning of spring, it is very easy to appear cold and cold, to avoid the occurrence of frost damage. To seize the time, use cold head warmers and medication when the temperature rises. In early spring, the temperature varies, and when applying pesticides, observe the local real-time weather forecast.
Pharmaceutical selection
Before we look at herbicides and herbicides, we must look at grasses, such as weeds and non-grass weeds; see the density of weeds and the problem of weed age. ).
Accurate selection of pharmaceuticals For the selection of chemical herbicides, it is important to choose products that are officially registered with the manufacturer, and do not use agents that contain recessive ingredients. At present, there are several types of pesticides in the market: grasses and weeds, represented by fenzotriazolone, clodinafop-propargyl, and can be used for plots mainly based on wild oats in areas north of Huaihe River. The single agent or compound preparation represented by methylsulfuron: can be used for precocious, hard-grass, and aphrodisiac-based regions along the southern Huaihua River. Broad-leaved weeds, single dimethyl tetrachlorosilane and compound preparations are used for Veronica, Cinnabarum sylvestris, S. sophia and S. pachyrhizi fields. Wheat must be used after 4 leaves and 1 heart until jointing.
The amount of drugs used
With the amount of the foot medicine, the amount of the foot water is uniformly sprayed and the mother liquid is prepared by double dilution. After the year, the time for chemical control of wheat is relatively short, and weed grass is relatively old. We must try our best to maximize the control effect. It is recommended to increase the dose of weeds for different types of weeds and weeds of different grass ages (not to increase blindly). , Reasonable compounding for chemical control. Chemical control at this time due to the rapid growth of wheat, the application must be guaranteed at least one mu of a barrel and a half of water, the second dilution of the preparation of the mother liquor, even spray to avoid the emergence of missing spray due to the wheat seedlings. Note: It is forbidden to fight herbicide when wheat enters the jointing stage.
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