三棱草属莎草科杂草，具有一年或多年生习性，田间很难防除，是塔里木垦区恶性杂草之一。其为害程度近几年随垦区植棉面积的扩大呈上升趋势。４１％农达水剂（美国孟山都公司生产）为灭生性内吸传导除草剂，对一年生、多年生的禾本科及阔叶杂草有良好的除草效果，防除三棱... Trifolia Sesaceacea weeds, with one year or perennial habits, the field is difficult to control, is one of the Talimu reclamation of the vicious weeds. The degree of harm in recent years with the expansion of cotton area under reclamation area is on the rise. 41% of Nongda water agent (produced by Monsanto, USA) is a biocidal systemic herbicide, which has excellent herbicidal effect on annual and perennial grass and broad-leaved weeds.