For weeding of winter wheat, weeding can usually be carried out twice in the seedling period before winter and the greening period of the following spring. The best weeding period is the 3~5 leaf period of wheat before winter. During this period, the emergence of weeds accounts for about 95% of the total number of weeds. The weeds in this period are small in age and have poor resistance to pesticides. This is the best time for chemical control. Effectively exert the herbicidal effect of the medicament, and the dosage is small, and the cost will be lower. One-time prevention and control can basically control the weeds in the wheat field during the entire growth period, which has a multiplier effect. The second peak of weeds unearthed in March of the following year, that is, when the wheat turns green to before jointing.
The weeding in the spring rejuvenation period is mainly for the plots where weeding is not carried out in time before winter and the weeds are more serious. For the plots where wild oats, bromegrass, and rhythms are severe, we can only use the period before winter for weeding, because some medicines on the market are only weeded at the 3 to 5 leaf stage of wheat and before the 3 leaf stage of weeds. effect******.
Prevention technology
1. Choose the best control period: After the 4 leaf stage of winter wheat and before pouring and freezing water, it is the best period for weed control in autumn, especially for the control of malignant weeds.
2. Choose the right medicine: (1) For wheat fields dominated by broad-leaved weeds such as Artemisia sowing, shepherd's purse, and septica vulgaris, use 7 grams of 10% tribenuron-methyl WP per acre to spray 30 kilograms of water; (2) For wheat fields where brome crops are the main cause, use 2 grams of 70% Tiger Water Dispersible Granules plus 10 grams of special additives to spray 30 kilograms of water per mu; (3) For wheat fields where cropping wheat is the main cause , Use 17-22 ml of 3% Shima oil suspension to spray 30 kg of water per mu.
3. Vigorously carry out unified prevention and control, and organize professional teams to conduct unified prevention and control of weeds to ensure the effect of weeding.
Precautions
The above medicaments must be used in strict accordance with the dosage per acre and the amount of water per acre. The medicament shall be diluted twice and applied evenly, and shall not be sprayed repeatedly or leaked. Choose a sunny day, no wind, when the minimum daily temperature is above 5°C and there is no frost and heavy rain in 4 days. The spraying time is preferably after 9 am and before 4 pm. In extreme weather, such as cold waves, generally do not use medicine. Do not use medicine in windy weather to prevent the liquid from drifting and causing phytotoxicity to nearby sensitive crops.
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