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我场水直播稻的连年种植及丁草胺等化学除草剂的单一重复使用,使双穗雀稗(Paspalumdistichum L.)等多年生杂草的发生量逐年上升,发生面积达50％以上,严重危害面积20％左右。一旦大发生可造成减产15～20％,且每亩增加拔草人工费25元,极大地影响经济效益的提高。为此,我们对水直播田双穗雀稗的发生、发展、危害做了系统观察,并对综合防治进行了定向研究,报告如下。
The successive planting of direct-seeded rice and the repeated use of chemical herbicides such as butachlor led to the year-by-year increase of perennial weeds, such as Paspalum distichum L., with an area of more than 50%, causing serious damage Area of about 20%. Once the big occurrence can result in cut 15% ~ 20%, and the increase of 25 yuan per mu labor costs, greatly affecting the economic benefits. To this end, we conducted a systematic observation of the occurrence, development and hazards of barnyardgrass in the field of direct seeding water and conducted a directional study on the integrated control and prevention. The report is as follows.