小麦田杂草出草危害时间长,受冬季低温抑制,常年有两个出草高峰,第一个出草高峰在播种后10~30天,第二个出草高峰在开春气温回升后。早播的麦田,秋季雨水多、气温高,冬前出草量大;春季雨水也多,杂草发生量也大。晚茬麦冬前出草量少,春季出草 Wheat weeds drags a long time, by the winter low temperature inhibition, perennial have two grassroots peak, the first grassroots peak 10-30 days after sowing, the second peak in the open spring after the temperature rise. Early sowing of wheat fields, autumn, more rain, high temperatures, large amount of winter before the drafting; more rain in spring, the amount of weeds are also large. Late crop before the winter wheat less grass, spring grass