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How to control broadleaf weeds in rape fields
With the widespread use of herbicides for grass weed control, the dominance of key weed species in winter rapeseed crops has gradually decreased. In contrast, broadleaf weeds such as *Chenopodium album* (goosefoot) and *Sinapis arvensis* (charlock) have become more prevalent, leading to the formation of mixed weed communities that include both monocotyledonous and dicotyledonous species. To effectively manage this evolving weed spectrum, it is essential to apply a combination of herbicides that target both types of weeds, thereby improving overall weed control efficiency.
1. **50% Triasulfuron Suspension Concentrate**
This post-emergence herbicide is specifically formulated to control annual broadleaf weeds, particularly *Chromolaena odorata*, *Cyperus brevifolius*, *Cyperus quinquefasciatus*, and *Brassica rapa*. It should be applied when the rapeseed plants are at the 6–8 leaf stage, and the weeds are at the 2–3 leaf stage. The recommended dose is 25–35 ml per mu (1 mu = 1/15 ha), with the higher rate used for more difficult-to-control weeds like swine fever (*Sida acuta*).
2. **6.9% Fenoxaprop-P-ethyl Emulsion**
This highly effective herbicide offers flexibility in application timing, suitable from the third leaf stage up to the tillering stage of weeds. It is especially effective against older, established weeds such as *Echinochloa crus-galli* (barnyard grass), *Digitaria sanguinalis* (crabgrass), and *Setaria viridis* (green foxtail). The recommended application rate is 600–900 ml per mu, mixed with 30 kg of water for foliar spraying.
3. **Green McLaughlin Grass Killer**
This mixture combines 25% green melon herbicide with 50% active ingredient, using 150 grams of each per mu, diluted in 20–40 kg of water. It is ideal for soil treatment, targeting both grassy and broadleaf weeds. This product is best suited for transplanted rapeseed fields where pre-emergence control is needed.
4. **Durga Glyphosate**
A 72% glyphosate formulation combined with 10% glyphosate at 50 ml and 400 ml per mu, respectively, mixed with 20–40 kg of water. This is applied 2–4 days before transplanting rapeseed to control existing vegetation on the field, including rice straw and residual weeds. It ensures a clean seedbed for optimal crop establishment.
By using these targeted herbicide combinations, farmers can achieve better long-term weed management, reduce the risk of resistance development, and improve the overall health and yield of their rapeseed crops. Always follow label instructions and consider local conditions when applying herbicides.
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