1. Select the appropriate herbicide varieties according to the weed species in the wheat field.
Any herbicide has a certain weeding spectrum, and it is impossible for a herbicide to effectively control all weeds in the field, so it is necessary to choose a suitable herbicide according to the types of weeds. The application of isoproturon in gramineous weeds has a good control effect on hard grass, milkweed, candle grass and Kentucky bluegrass. Both of them are post-emergence herbicides of gramineous weeds in wheat fields. Sima can't control Bromus, Kentucky bluegrass, Aegilops tauschii and Lolium perenne, but Shima has better control effect on the above weeds. Maixi, dicamba, Bensulfuron-methyl, Bensulfuron-methyl, Chlormequat chloride and Bensulfuron-methyl are effective in controlling broad-leaved weeds, but they are ineffective in controlling gramineous weeds.
Second, choose the best time to apply pesticides.
The best medication period: tillering stage before winter and early jointing stage of wheat in the following year. Application temperature and humidity: all herbicides should be used in sunny days with high temperature, and it is appropriate to use them from 10 am to 3 pm. If the soil is dry, it is necessary to increase the water consumption to ensure the control effect.
Third, the dosage and mixing of chemicals.
The use of the same herbicide for many years will easily lead to the gradual decrease of sensitive weeds and the increase of drug-resistant weeds. Mixing herbicides may slow down drug resistance. The main problem that should be paid attention to when mixing herbicides is that several herbicides after mixing should not have antagonistic effect. If there is antagonism, it is best not to mix them.
Four, the preparation and application technology of herbicides
The correct preparation method is the secondary dilution method: firstly, the medicine is mixed with a small amount of water to make mother liquor, and then it is poured into a sprayer with a certain amount of water, and then the water to be added is added, while stirring, and evenly diluted to the required concentration. It is forbidden to pour the medicine first and then add water, so that the medicine is easy to deposit on the straw of the sprayer, so that the sprayed liquid medicine has a high concentration first, which is easy to cause phytotoxicity, while the sprayed liquid medicine has a low concentration and poor weeding effect. In addition, it is not allowed to pour the medicine into the sprayer containing a large amount of water at one time, so that the wettable powder often floats on the water meter or forms small pieces, which are unevenly distributed, not only can not guarantee the effect, but also it is easy to block the spray hole when spraying. In addition, the liquid medicine should be prepared with clear water. (China Agricultural Extension Network)