Annual weeds in summer maize fields compete with the crop for water, nutrients, and light, and fields with severe weed infestations show significant yield reductions. Herbicide selection for weed control should be based on the target annual weed species and their precise growth stage—Atrazine 40% WP (a combined formulation of acetochlor and atrazine) is registered for the control of annual weeds in summer maize fields.
For annual weeds in summer cornfields, the herbicides used for grasses differ from those for broadleaf weeds, and the application methods also vary between pre-emergence and post-emergence treatments. Soil-residual (pre-emergence) herbicides should be applied after sowing but before crop emergence, forming a herbicide film over the soil surface. For post-emergence foliar treatments, spray directionally when weeds reach the 3–5 leaf stage and the crop is relatively safe.
Atrazine 40% Atrazine Wettable Powder, Registration No. PD20082417 (subject to the actual label). Used for the control of annual weeds in summer cornfields at a rate of 200–250 g/mu, applied as a soil spray after sowing and before seedling emergence. Dilute with water according to the weed spectrum and crop growth stage, and spray evenly, taking care to avoid drift onto the crop.
For stem and leaf herbicide application, lower the nozzle and spray only the weeds, avoiding herbicide drift onto crop plants to prevent injury. Do not spray on windy days or before rain. Dosage varies significantly among different formulations; conduct small-scale trials first before large-scale application. Always follow the label instructions.
