宁夏灌区稻田杂草为害严重,每年花在除草上的工很多。如撒播稻田,单除草一项,所用的人工就占生产总用工的三分之一以上,个别地区,由于劳力不足,除草不及时,甚至造成草荒。严重发生三棱草的稻田,主要是低洼湖田、河滩地、常年稻田和轮作田的低湿地段。这些田块,由于历年翻晒不良,耕作管理比较粗放,造成三棱草大量繁殖,这部分稻田约占稻田总面积的三分之一左右。为害我区稻田的三棱草,最主要的是扁 Weed in paddy fields in Ningxia irrigation serious damage, many people spend on weeding each year. If sowing paddy fields, weeding alone, the labor used to account for more than one third of the total production of labor, in some areas, due to lack of labor, weeding is not timely, and even caused grass wasteland. Scull the serious rice fields, mainly lowland lake, floodplain, perennial paddy field and crop rotation field of low wetlands. These plots, due to poor sunning over the years, farming management is more extensive, resulting in a large number of Prunus breed, which accounts for about one-third of the total paddy field area. Sanxian grass damage to our area of ​​rice, the most important is flat