Annual grass weeds in rice paddies compete with the crop for water, nutrients, and light, and fields with severe weed infestations show significant yield reductions. Herbicide selection for control should be based on the target annual grass weed species and their precise growth stage—oxadiazon 250 g/L EC is registered for the control of annual grass weeds in rice paddies.
For annual weeds in rice paddies, the herbicides used for grasses differ from those for broadleaf weeds, and the application methods also vary between pre-emergence and post-emergence treatments. For soil-residual (pre-emergence) control, the herbicide should be applied after sowing but before crop emergence, forming a herbicide film over the soil surface. For post-emergence foliar treatment, spray directionally when weeds are at the 3–5 leaf stage and when the crop is relatively safe.
Oxadiazon 250 g/L EC (Emulsifiable Concentrate), Registration No. PD20080659 (subject to the actual label). Used for the control of annual grass weeds in paddy rice fields, at a dosage of 120–130 mL per mu (667 m²), applied via the herbicide-amended soil method. Dilute with water and spray evenly according to the weed spectrum and crop growth stage; take care to avoid spray 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 product label for specific instructions.
