2, 4-D amine is mainly used in wheat, barley, corn, sorghum, rice and other gramineous crops fields and gramineous grassland in quinoa, Polygonum, Shepherds purse, Descurainia Sophia and other broad-leaved weeds, to gramineous weeds ineffective. Application Method and dosage: stem and leaf spray, 0.5 kg-2.3 kg ai/ha.