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摘要:通过田间小区试验验证了2%双唑草腈颗粒剂(GR)对机插秧稻田杂草的防效及对水稻的安全性。结果表明:机插秧水稻移栽后12 d,2%双唑草腈GR 600 g/667 m2及其以上剂量撒施处理对机插秧田稗属杂草、千金子、鸭舌草、耳叶水苋、鳢肠、异型莎草等杂草的株数和鲜质量防效优于机插秧稻田常规2次封闭施药处理(移栽前3 d 50%苯噻·苄WP 70 g/667 m2 毒土撒施+移栽后12 d 50% 丙·苄WP 80 g/667 m2毒土撒施),且对水稻安全。水稻移栽后12 d 2%双唑草腈GR 600 g/667 m2撒施处理1次用药可有效控制机插秧稻田稗属杂草、千金子、鸭舌草、耳叶水苋、鳢肠、异型莎草等杂草,具有节本减药的综合效益,且对水稻安全,在机插秧稻田的推广应用前景广阔。
关键词:双唑草腈;水稻;机插秧;除草活性;安全性
中图分类号:S451 文献标志码:A 文章编号:1003-935X(2016)03-0045-05
The Efficacy and the Selectivity of Pyraclonil 2% GR
in Mechanically Transplanted Rice Fields
XU Peng1,2,WANG Hongchun2,WU Jiawen3,XIAO Weizhu4,WANG Yaxiong4,LOU Yuanlai2
(1. College of Plant Protection,Nanjing Agricultural University,Nanjing 210095,China;
2. Institute of Plant Protection,Jiangsu Academy of Agricultural Sciences,Nanjing 210014,China;
3. Jiangsu Plant Protection and Plant Quarantine Station,Nanjing 210013,China;
4. College of Life Science,Nanjing Agricultural University,Nanjing 210095,China)
Abstract:Field experiments were conducted to confirm the efficacy and selectivity of pyraclonil 2% granules (GR) in mechanically transplanted rice fields. Pyraclonil 2% GR applied at the dose of 600 g/667 m2 efficiently controlled Echinochloa spp. ,Leptochloa chinensis (L. ) Nees. ,Monochoria vaginalis (Burm. F. ) Presl. ,Ammannia arenaria H. B. K. ,Eclipta prostrata (L) L. ,and Cyperus difformis L. at 12 days after transplanting in mechanically transplanted rice fields. The control effects of pyraclonil 2% GR applied at the dose of 600 g/667 m2 were significantly higher than control treatment. Pyraclonil 2% GR applied at 450 g/667 m2 to 1 200 g/667 m2 at 12 days after transplanting were safe to mechanically transplanted rice.
Key words:pyraclonil;rice;mechanically transplanted rice;herbicidal activity;safety
隨着农村土地流转和劳动力的转移,省工省时的水稻机插秧栽培方式在我国推广种植面积日益扩大[1],已成为水稻的主导栽培方式之一。机插秧水稻秧苗小、栽植株行距宽,田间杂草发生种类多、数量大、发生期长,杂草危害严重,而田间草害防控多套用传统人工插秧栽培除草方案,除草成本高、效益低,制约着水稻机插秧栽培的推广应用[2]。
目前,机插秧稻田杂草化学防除多采用“两封一补”的模式,即在水稻插秧前第一次封闭与水稻插秧后10~15 d第二次封闭相结合为主,在水稻生长中后期视田间杂草状况予以补施茎叶处理除草剂的化学除草技术。2次毒土撒施……