江苏省主棉区棉田杂草有 1 2 4种 (含变种 ) ,隶属于 37科、 93属 ,其中恶性杂草有马唐、铁苋菜、稗、鳢肠、狗尾草、马齿苋、牛筋草、千金子和刺儿菜等 9种 ,区域性恶性杂草 1 3种 ,常见杂草 2 0种 ,一般杂草 82种。发生优势度最大的为马唐、铁苋菜、稗、鳢肠 ,是江苏各棉区杂草群落的优势种。由于棉花耕作栽培方式的不同 ,导致杂草的发生有差异 ,在水旱轮作棉田 ,稗、千金子、牛繁缕等喜湿性杂草的发生优势度较大 ;而在旱连作棉田 ,狗尾草、牛筋草、刺儿菜、波斯婆婆纳、香附子、苣荬菜等旱生性杂草种群发生较多。江苏棉田的杂草危害基本上以 1～ 2级为主 ,3～ 5级出现的田块相对较少。各棉区发生的杂草种类亦有差异 ,沿江棉区的杂草危害最严重 ,沿海棉区和淮北棉区次之 ,里下河棉区又次之。就江苏各棉区棉田总体情况来看 ,旱 旱连作棉田杂草的危害程度比水 旱轮作棉田略高 There were 124 (including varieties) of weeds in the main cotton-growing area of ​​Jiangsu Province, belonging to 37 families and 93 genera. Among them, the weeds had crabgrass, iron amaranth, barnyardgrass, colon, foxtail, purslane, tendon 9 kinds of grass, stem gold and thorns, 13 kinds of regional weeds, 20 common weeds and 82 kinds of common weeds. The dominant species of Crabgrass, Echinochloa crusgalli, Echinochloa crusgalli were the dominant species of weed communities in each cotton area of ​​Jiangsu Province. Due to the different tillage and cultivation methods of cotton, the occurrence of weeds was different, and the occurrence of the weedy weeds such as cotton barley, barnyardgrass, Tendon grass, Calendula officinalis, Persian Pina, Cyperus rotundus, endangered plants such as weed populations more occurrence of weeds. The weeds in Jiangsu cotton field are basically dominated by 1 ~ 2 grades, while those with 3 ~ 5 grades are relatively few. The weed species in each cotton area is also different. The weeds in the cotton area along the Yangtze River are most seriously endangered. The coastal cotton area and the cotton area in Huaibei are second, and the cotton area in the lower river is second. According to the overall situation of cotton fields in cotton fields in Jiangsu Province, weeds in dryland and even dry cotton fields are harder than weeds in rotation and drought in cotton fields