对千金子在直播稻田的发生高峰及叶片生长速度进行了观察 ,并对化学除草及水控除草的效果作了研究。结果表明 ,千金子在直播田只有一个发生高峰期 ,单季晚稻直播田和连作晚稻直播田发生高峰期在播后 1周 ,早稻直播田发生高峰期在播后 2周。千金子的叶片生长速度较水稻秧苗快 1叶左右 ,其生长量前期较小 ,后期较大。扫特、千金、威霸、去稗安和拜田净对千金子防除效果均达 92 .2 %以上 ,适宜的水管理也可以有效防除千金子 In this paper, we observed the peak occurrence and the growth rate of leaves in direct-seeded rice fields, and studied the effects of chemical weeding and water control weeds. The results showed that there was only one peak occurred in direct seeding field. The peak of single seeding late seeding and late seeding direct seeding occurred within 1 week after sowing. The peak of direct sowing in early rice occurred 2 weeks after sowing. Thousand gold leaf growth rate than the rice seedling about 1 leaf, its growth is smaller in the early, larger late. Sweep special, daughter, Wei Pa, to barnyard grass and net benefits of the net benefits of gold have reached more than 92 .2%, appropriate water management can also effectively control thousands of gold