作为轻型栽培重要组成的直播稻的推广，其高产、省工节本等优点被广大农户所接受，种植面积逐年扩大，但恶性杂草千金子数量也逐年上升。千金子为禾本科千金子属的一年生草本，株高３０～９０ｃｍ，茎秆细，直立，基部膝曲，叶片条状披针形，叶鞘无毛，叶舌膜质，在５叶前几乎 As an important component of light-weight cultivation of direct-seeding rice, its advantages such as high yield, provincial cost-effective are accepted by the majority of peasants. The planting area has been expanded year by year, but the number of malignant weeds has also increased year by year. Thousand gold is an annual herbaceous cadmium genus, plant height 30 ~ 90cm, stems thin, erect, base geniculate, leaf blade lanceolate, leaf sheath glabrous, ligule membranous, almost 5 leaf before