Dosage: Rice-250-400Ml/Acre ,Tea-250-400Ml/Acre ,Onion-180-350Ml/Acre ,Potato-180-350Ml/Acre ,Groundnut-180-351Ml/Acre. Oxyfluorfen controls weeds by inhibiting an essential enzyme known as protoporphyrinogen oxidase or “protox” for short. This leads to the death of the plant’s tissues.