我县稻茬麦常年占三麦面积的90%以上,以看麦娘、硬草、千金子为主的禾本科杂草是麦田主要恶性杂草,全县发生面积25万亩左右,占三麦面积的39.7%,杂草密度每平方尺200～300株,严重田块超过千株。近几年,冬前化除已达18万亩,但草害造成的损失每年仍在1000万斤左右。1984～1986年,我站对麦田禾本科杂草在免、旋耕田的出草规律及化除技 County rice stubble perennial accounts for more than 90% of the total area of ​​three wheat to see Ophiopogon, hard grass, gold-based grass weeds are the main wheat weeds weeds, the county occurred an area of ​​about 25 acres, accounting for three 39.7% of the wheat area, weeds density of 200 to 300 lines per square foot, more than a thousand serious plots. In recent years, except for the 180,000 mu of prewinnification, the damage caused by grass damage is still about 10 million kilos per year. 1984-1986, I station on wheat field weed grasses in free and rotary plowing law and the removal of technology