20%双草醚可湿性粉剂对水稻直播田杂草的防除效果及安全性评价  

Efficacy and Selectivity of Bispyribac-sodium 20% WP in Direct-Seeded Rice Fields

作　　者：余铮[1] 邓莉立 谭显胜[1] 金晨钟[1] 王义成[1] 

机构地区：[1]湖南人文科技学院/湖南省农田杂草防控技术与应用协同创新中心/农药无害化应用湖南省高校重点实验室,湖南娄底417000 [2]湖南人文科技学院材料与环境工程学院,湖南娄底417000

出　　处：《杂草学报》2017年第3期38-42,共5页Journal of Weed Science

基　　金：湖南省自然科学基金(编号:12JJ6026);湖南省高校创新平台开放基金(编号:14K053);湖南省高校产业化培育项目(编号:13CY030)

摘　　要：研究20%双草醚可湿性粉剂对水稻直播田杂草的防控效果和应用安全性,可为水稻直播田草害的化学防控提供科学依据。在大田试验中采用4种浓度的20%双草醚可湿性粉剂及100 g/L双草醚悬浮剂对水稻直播田中稗、异型莎草、鸭舌草、丁香蓼等一年生杂草的防除效果进行测定,且对水稻的增产效果和安全性进行分析。结果表明,20%双草醚可湿性粉剂对水稻直播田中稗、异型莎草、鸭舌草、丁香蓼等一年生杂草具有良好的防除效果,其总草株防效及鲜质量防效均高于86.7%,其有效成分的用量为30 g/hm^2时,与对照药剂100 g/L双草醚悬浮剂的防效基本一致。20%双草醚可湿性粉剂对水稻安全,各处理收获后经测产分析,增产幅度达8.7%~14.1%。因此,20%双草醚可湿性粉剂对水稻直播田中稗等一年生杂草的防除效果优良,具有良好的应用前景,推荐用药量(有效成分)为30~45 g/hm^2。The efficacy and selectivity of bispyribac-sodium 20% WP in direct-seeded rice fieldswere studiedto provide the scientific basis for chemical weeding.The efficacy ofbispyribac-sodium 20% WP and bispyribac-sodium 100 g/L SC on annul weeds such as Echinochloa crus-galli(L.) Beauv,Cyperus difformis L.,Monochoria vaginalis(Burm.f.) Presl,and Ludwigia prostrata Roxb.was determinedin a field experiment,as well as their selectivity and effect on rice crop yield.Bispyribac-sodium 20% WP effectively controlled annual weeds such as E.crus-galli,C.difformis,M.vaginalis and L.prostrata at above 86.7% based on plant density and fresh weight.The efficacy of bispyribac-sodium 20% WPat 30 g a.i./hm^2 was consistent that obtained withbispyribac-sodium 100 g/L SC.Bispyribac-sodium 20% WP was safe to rice,and the yield of rice was increased by 8.5% ~ 14.0% after spraying herbicide.Therefore,bispyribac-sodium 20% WP had good control effect on annual weeds including E.crus-galli in direct-seeded rice fields,and the recommended dose was 30 ~45 g a.i./hm^2.

关 键 词：双草醚 水稻直播田 稗 一年生杂草 防除效果 安全性 

分 类 号：S451.21[农业科学—植物保护]