由于近年来北方地区连续干旱，造成冀东地区部分水稻插秧田改为旱直播田，且面积逐年扩大。随着旱直播田的不断发展，杂草谱也由以稗草为优势种演变为稗草、马唐、藜、苋、莎草等混合发生，从而给防除带来了很大困难。为了解决水稻旱直播田化学除草问题，昌黎县农业局植保站连? Due to the continuous drought in northern China in recent years, some rice transplanting fields in eastern Hebei were changed to dry seeding and the area has been expanding year by year. With the continuous development of dry direct seeding fields, the weed spectrum evolved from being dominated by barnyardgrass to barnyardgrass, crabgrass, pigweed, amaranth, sedge and other mixtures, which brought great difficulties for the prevention and control. In order to solve the problem of chemical weeding on dry land in paddy fields, Plant Protection Station in Changli County Agriculture Bureau