根据我们多年的观察和调查,稻田主要杂草分三方面。一是窄叶杂草,以禾本科的稗草最普遍,危害最严重。其次是莎草科或针叶类的杂草,在局部地区会成灾,如牛毛毡、萤蔺、荆三棱。还有一类是阔叶杂草,如矮慈姑、鸭舌草、眼子菜等,在局部地区均可能严重发生。在水稻生长前期,杂草生长快,为害最大,每平方米有稗草20株,可使稻谷减产30%,每平方米有鸭舌草80株,可使稻谷减产25%, According to our many years of observation and investigation, the main weeds in rice fields are divided into three aspects. First, narrow-leaved weeds to gramineous barnyard grass most common, the most serious harm. Followed by Cyperaceae or coniferous weeds, will be disaster in some areas, such as cattle blankets, Ying Lin, Jing Triangular. There is a class of broad-leaved weeds, such as short arrowheads, Monochamus, octopus, etc., may be serious in some areas. In the early stage of rice growth, the weeds grow fast and have the most damage. There are 20 barnyardgrass per square meter, which can reduce the rice yield by 30%, and there are 80 monocotyledons per square meter, which can reduce the rice yield by 25%