水稻是黑龙江肇源县主栽作物之一,每年种植面积达70万亩,为全县粮食高产稳产做出了重要贡献。1981年本县开始种植水稻,当时稻田发生的杂草主要是稗草、莎草科杂草和眼子菜等。由于大量使用酰胺类、三氮苯类除草剂,禾本科杂草和眼子菜等得到了控制,而莎草科杂草逐步上升为水田恶性杂草。到20世纪90年代中期,由于普及使用以苄嘧磺 Rice is one of the main crops in Zhaoyuan County, Heilongjiang Province. The annual planting area is 700,000 mu, making an important contribution to the high and stable grain yield throughout the county. In 1981, the county started to grow rice. At that time, the weeds in paddy fields were mainly barnyard grass, sedge weed and octopus. Due to the extensive use of amides, triazine-based herbicides, gramineous weeds and ophthalmophilus were controlled, while the sedges and weeds gradually increased to the weeds in the paddy fields. By the mid-90s of the 20th century, bensulfuron-methyl was widely used