Rapeseed is one of the main rapeseed producing areas in the middle and lower reaches of the Yangtze River , an important oil crop in China . The climatic conditions in this region are suitable for the growth of rapeseed, and it is also conducive to the occurrence of weeds. There are many types of weeds and heavy damage. Therefore, the correct use of herbicides to control weed damage is an important measure to ensure the continuous increase of production and efficiency of rapeseed.
Generally speaking, weeds in the rapeseed field in the region have two grassing periods. Taking Anhui as an example, the first weeding period along the Yangtze River and the Jiangnan region is from late September to mid-November, and the second weeding period is in Hunchun. From the beginning of February to the beginning of March, the two outflow periods between the Jianghuai and the Huaihe River were delayed by 7 to 10 days. The main weeds in this area mainly include maiden, bluegrass, hard grass, small canopy, and leeks. The cultivation method has an effect on the occurrence of weeds. Generally, the live rapeseed reaches the first peak of grassing 7 to 20 days after sowing, and the transplanted rapeseed reaches the first peak of grassing 10 to 25 days after planting. The no-tillage grass is early and the amount is large.
After emergence or transplanting, the pesticides for controlling grass weeds such as Mai Niang are mainly high-efficiency grass, verapamil, etc. Among them, quick catching has a good control effect on bluegrass. Generally, depending on the grass condition and seedling condition, in the weeds 2 to 4 leaf stage, 10.8% of the high-efficiency grass emulsifiable concentrate 30ml or 5% fine quizalofol emulsifiable concentrate 50-60ml or 15% refined emulsifiable concentrate 30~50ml per acre. , 30 to 40 kg of water, evenly sprayed. High temperature and good control effect. Therefore, the early use of grass peaks should be used as soon as possible.
The chemical herbicide acetochlor (Wernes) can be used for soil treatment before or after transplanting of rapeseed, which can prevent grass weeds such as A. sinensis in rapeseed field, and also has a role in treating some broad-leaved weeds. Use 50% acetochlor EC 0-100ml per acre, or 90% Wones emulsifiable concentrate 45ml, add water 30~40kg, spray on the rapeseed after sowing the soil, and plow the transplanted field before spraying. To prevent direct contact between the drug solution and the rapeseed seed, after the application, the field should avoid water accumulation, and the soil water content should not be too high. Otherwise, it may cause phytotoxicity, and the transplanted field should also prevent water accumulation.
It is herbicide removal to control the broadleaf weeds after emergence or transplanting. Generally, 30 ml of a 50% herbicide suspension agent per acre is used, and 40 kg of water is sprayed on the acre, which has special effects on the cattle and the stalk. Herbicide can only be used in the strong seedlings of Brassica napus (hybrid rapeseed) (more than 6 leaves), and the dosage should be strictly controlled, otherwise it will easily cause phytotoxicity.
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