Weed survey was conducted in the corn field in Hebei province from 1997-2000. According to the survey, there were more than 30 weed species including the dominant weeds of crabgrass (Digitaria ciliarris), barnyardgrass (Echinochloa crusgalli), field bindweed (Convolvulus arvensis), goosegrass(Eleusine indica), green foxtail(Setaria viridis), purselane(Portaulaa olerancea), redroot pigweed(Amarinthes retroflexes).It was difficult to control the weeds in the corn field for they growing flourish in the high temperature and rainy season. Chemical control is the effective method in this case and also wheat straw mulching could help to reduce the herbicide rate.
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