1. Choose herbicides according to the type of weeds
Any herbicide has a certain herbicidal spectrum, anti-wideleaf weeds, anti-grass weeds, and some grasses and broadleaf weeds. However, a herbicide cannot effectively control all weeds in the field. Therefore, it is necessary to find out which weeds are in the field and select herbicides according to the main weed species.
2, grasp the best period of application
Chemical weeding before winter, generally in the wheat 3 leaf stage, the weeds are basically out and the tissue is fine and the best effect, from mid-late November to mid-December, that is, 40 days after wheat sowing is appropriate. In addition, for the plots where wild oats occur seriously, weeding can only be carried out before winter, because some herbicides sold on the market are only in the 2-4 leaf stage of wheat, and the best effect is applied before the 3 leaf stage of weeds.
3, chemical weeding before winter should grasp the temperature and sensation
Choose a sunny, windless weather spray to prevent herbicide drift and produce phytotoxicity. The application time is when the temperature is higher from 10:00 am to 3:00 pm and the temperature is above 10 °C. The efficacy of most herbicides requires a certain degree of sensation, and the sensation of the herbicide is beneficial to the efficacy of the herbicide at 40%-60%. Due to the impact of this year's drought, most of the wheat fields are dry, and the application of herbicides should be carried out in time after watering or rainfall.
4. Recommended chemical herbicides
The wheat field with the general weed as the main control object, the 10% benzenesulfuron-methyl WP 10-12 g water spray 30 kg spray control; the malignant weed lacquer, pig mites as the main control wheat field, acres Use 20% to make it 30-40 ml of prolactin + 10% bensulfuron-methyl wettable powder 10 g with water 30 kg spray control; wild oats as the main control wheat field, with 6.9% Hummer water emulsion 60 ml + 10% bensulfuron-methyl WP 10g with water 30kg spray control.
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