The invention discloses a herbicide composition for a
corn field. The herbicide composition comprises
sulfentrazone,
atrazine and isoxadifen-ethyl (or salt of isoxadifen-ethyl), wherein the weight ratio of
sulfentrazone to
atrazine to isoxadifen-ethyl is (1-50) to (1-50) to (1-25). The herbicide composition can be prepared into the following preparations:
wettable powder, suspending agent, dispersed oil suspending agent,
microemulsion,
emulsion in water or
water dispersible granules. The herbicide composition has a remarkable synergistic effect, and can be used for controlling graminaceous weeds, broad-leaved weeds and
cyperaceae weeds including crab grass, green bristlegrass,
eleusine indica, chenopodium album, dayflower,
sonchus brachyotus, cephalanoplos seyetum, purslane,
abutilon and the like which are difficult to control; after the herbicide composition is used, the effectiveness of all single preparations can be improved, the
drug resistance of the weeds can be obviously delayed, the usage amount of the
pesticide is reduced, and the agricultural cost is lowered. Isoxadifen-ethyl (or salt of isoxadifen-ethyl) is fed into the herbicide composition, so that the herbicide composition is safe for
crop corns and is also used for sweet corns.