50%双环磺草酮悬浮剂及其混剂对移栽稻田杂草的防效和安全性  

The control effect and safety of benzobicyclon 50%SC and its mixture on the weeds in transplanted rice fields

作　　者：饶镭 邹子玉 刘浪 罗娟 李保同[1] RAO Lei;ZOU Ziyu;LIU Lang;LUO Juan;LI Baotong(College of Agricultural Sciences, Jiangxi Agricultural University, Nanchang 330045, China;College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045, China)

机构地区：[1]江西农业大学农学院,南昌330045 [2]江西农业大学国土资源与环境学院,南昌330045

出　　处：《植物保护》2022年第3期312-320,共9页Plant Protection

基　　金：“十三五”国家重点研发计划(2017YFD0301604);江西省科技支撑计划(20151BBF60070);江西省农业(水稻)产业技术体系项目(JXARS-02)。

摘　　要：为明确50%双环磺草酮SC及其混剂35%双环磺草酮·五氟磺草胺·苄嘧磺隆SC对稻田主要杂草的防治效果及其安全性,采用茎叶喷雾法试验了50%双环磺草酮SC及其混剂对杂草的防效和对供试籼稻和粳稻生长的安全性。结果表明:50%双环磺草酮SC施用剂量为300 g/hm^(2)时,药后35 d杂草株防效为65.38%~90.79%,对供试籼稻和粳稻安全,当使用剂量增加到487.5 g/hm^(2)时,对供试籼稻‘泰丰优736’产生明显药害,水稻植株叶片白化枯死,植株较矮,分蘖数少;当使用剂量增加到600 g/hm^(2)时,供试粳稻(‘甬优1538’)发生轻微药害,而当使用剂量增加到975 g/hm^(2)时,供试籼稻发生严重药害,药害率和死亡率分别为58.83%~68.59%和44.17%~62.18%,减产75.48%~75.55%;有13.89%~19.08%的供试粳稻产生药害,减产19.35%~21.70%。双环磺草酮单独施用时对稻田杂草具有较好的防治效果,但对水稻安全性较差,不适合在籼稻田施用,在粳稻田的推荐施用量为300~487.5 g/hm^(2)。35%双环磺草酮·五氟磺草胺·苄嘧磺隆SC在210~315 g/hm^(2)施用剂量下对供试籼稻和粳稻安全,药后15 d和35 d对稻田阔叶类杂草和其他杂草的株防效和鲜重防效均在92%以上,对禾本科杂草的株防效和鲜重防效分别在77.86%~98.52%和76.85%~94.98%,对供试籼稻和粳稻品种均具有一定的增产效果,与空白对照相比,分别增产5.31%~23.77%和19.78%~26.88%。本着高效经济安全的原则,35%双环磺草酮·五氟磺草胺·苄嘧磺隆SC在稻田推荐用量为210~262.5 g/hm^(2),于水稻移栽后杂草萌发期施用。In order to clarify the control effect and safety of benzobicyclon 50%SC and its mixture benzobicyclon·penoxsulam·bensulfuron-methyl 35%SC on the main weeds in paddy fields,a stem and leaf spray method was used to test the control effect of benzobicyclon 50%SC and its mixture on weeds and its safety on the growth of indica and japonica rices.The results showed that,when benzobicyclon 50%SC was applied at a dose of 300 g/hm^(2),the control effect on weed plants was 65.38%to 90.79%35 days after the treatment,which was safe for the tested indica and japonica rices.When the dose increased to 487.5 g/hm^(2),the tested indica rice‘Taifengyou 736’showed obvious phytotoxic symptoms:the leaves of rice plants were bleached and died,and the plants were dwarf,and the number of tillers was small;when the dosage was increased to 600 g/hm^(2),the tested japonica rice‘Yongyou 1538’exhibited slight phytotoxic symptoms;when the dosage was increased to 975 g/hm^(2),the tested indica rice suffered serious phytotoxicity,with an injury rate and mortality of 58.83%-68.59%and 44.17%-62.18%,respectively,and the yield was reduced by 75.48%-75.55%.In contrast,the tested japonica rice showed an injury rate of 13.89%-19.08%,and the yield was reduced by 19.35%-21.70%.Benzobicyclon alone had a good control effect on rice field weeds,but with a poor level of safety on rice.It is not suitable for application in indica rice fields.The recommended dose for benzobicyclon alone in japonica rice fields was 300-487.5 g/hm^(2),but for benzobicyclon·penoxsulam·bensulfuron-methyl 35%SC,it was 210-315 g/hm^(2),which was safe for the tested indica and japonica rice.The plant control effect and fresh weight control effect against broad-leaved weeds and other weeds in paddy fields 15 days and 35 days after application were both above 92%,while those against Gramineous weeds were 77.86%-98.52%and 76.85%-94.98%,respectively,but with a yield increase effect on the tested indica and japonica rice varieties to some extent:compared with the negative co

关 键 词：双环磺草酮 五氟磺草胺 苄嘧磺隆 防效 安全性 

分 类 号：S451.21[农业科学—植物保护]