建立了超高效液相色谱-串联质谱法检测水果蔬菜中甲磺草胺的方法。样品采用乙腈提取,C18固相萃取柱净化,以Thermo Hypersil GOLD a Q色谱柱进行分离,通过正离子扫描模式进行定性和定量检测。结果表明,分别对苹果、橙子、提子、白菜、豇...建立了超高效液相色谱-串联质谱法检测水果蔬菜中甲磺草胺的方法。样品采用乙腈提取,C18固相萃取柱净化,以Thermo Hypersil GOLD a Q色谱柱进行分离,通过正离子扫描模式进行定性和定量检测。结果表明,分别对苹果、橙子、提子、白菜、豇豆、胡萝卜、黄瓜等7种空白基质添加0.01~0.10 mg/kg农药的样品进行回收率实验,平均回收率均在109.8%~73.9%之间,相对标准偏差均小于9.1%。方法为检测水果蔬菜中甲磺草胺农药残留提供了有效的检测方法。展开更多
A preliminary study conducted in the central USA near Colby and Hays, Kansas (KS) in 2010 indicated a premix of S-metolachlor & sulfentrazone codenamed F7583 (Broadaxe?) had good potential for use in sunflower (He...A preliminary study conducted in the central USA near Colby and Hays, Kansas (KS) in 2010 indicated a premix of S-metolachlor & sulfentrazone codenamed F7583 (Broadaxe?) had good potential for use in sunflower (Helianthus annuus L.). Additional studies were conducted in 2011 at Colby, Hays, Manhattan, KS to refine rate and application timing of F7583 for weed control and crop safety. Four rates of F7583 (860, 1100, 1350 and 1840 g·ha-1) were compared to single rates of S-metolachlor and pendimethalin, and applied 21 days preplant versus preemergence (PRE). F7583 at ≥1100 g·ha-1 applied preplant or PRE controlled Palmer amaranth (Amaranthus palmeri S. Wats.) and kochia [Kochia scoparia (L.) Schrad.] ≥95% and 100%, respectively in neutral pH soils. In slightly acidic soils, PRE application of F7583 was more effective against Palmer amaranth and grass weeds compared to preplant application. No benefit was gained by increasing the rate of F7583 from 1100 to 1350 g·ha-1 at either application timing. Puncturevine (Tribulus terrestris L.) control was not commercially satisfactory with F7583 at any rate or time of application. Both S-metolachlor at 1070 g·ha-1 and pendimethalin at 1600 g·ha-1 applied either preplant or PRE were considerably less effective on all three broadleaf weeds compared to F7583 treatments. Individually, S-metolachlor and pendimethalin were more effective when applied PRE compared to preplant application. F7583 did not reduce sunflower plant population or visibly injure sunflower anytime during the season.展开更多
Eight field trials (<span style="font-family:Verdana;">2 in 2016, 3 in 2017, 3 in 2018) </span><span style="font-family:Verdana;">were conducted</span><span style="f...Eight field trials (<span style="font-family:Verdana;">2 in 2016, 3 in 2017, 3 in 2018) </span><span style="font-family:Verdana;">were conducted</span><span style="font-family:;" "=""><span style="font-family:Verdana;"> in farmers’ fields with heavy infestations of GR </span><i><span style="font-family:Verdana;">Conyza</span></i><span style="font-family:Verdana;"> <i>canadensis</i></span><span style="font-family:Verdana;"> (Canada fleabane, horseweed or </span><span style="font-family:Verdana;">marestail</span><span style="font-family:Verdana;">) </span></span><span style="font-family:;" "=""><span style="font-family:Verdana;">to evaluate glyphosate (900 g ae ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">) plus </span><span style="font-family:Verdana;">saflufenacil</span><span style="font-family:Verdana;"> (25 g ai ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">), 2,4-D ester (500 g ai ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">) or paraquat (1100 g ai ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">) applied </span><span style="font-family:Verdana;">preplant</span><span style="font-family:Verdana;"> (PP) as 2-way </span><span style="font-family:Verdana;">tankmixes</span><span style="font-family:Verdana;">, or in 3-way </span><span style="font-family:Verdana;">tankmixes</span><span style="font-family:Verdana;"> with sulfentrazone (140 g ai ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">), flumioxazin (107 g ai ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">) or metribuzin (400 g ai ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">)</span><span><span style="font-family:Verdana;"> for the glyphosate-resistant (GR) </span><i><span style="font-family:Verda展开更多
A field study was conducted at two locations in Kansas, USA in 2011 and 2012 to test weed control efficacy and crop response to preemergence-applied pyroxasulfone alone and in combination with sulfentrazone in sunflow...A field study was conducted at two locations in Kansas, USA in 2011 and 2012 to test weed control efficacy and crop response to preemergence-applied pyroxasulfone alone and in combination with sulfentrazone in sunflower. Treatments included three rates of pyroxasulfone (100, 200 and 400 g·ha-1) applied alone and tank-mixed with sulfentrazone at 70, 140 and 280 g·ha-1. Commercial standards sulfentrazone at 140 g·ha-1 + pendimethalin at 1390 g·ha-1 and sulfentrazone at 140 g·ha-1 + S-metolachlor at 1280 g·ha-1 were also included. Pyroxasulfone at 100 g·ha-1 controlled Palmer amaranth 87% at 3 weeks after application (WAA), but control decreased to 76% at 6 WAA. Increasing pyroxasulfone rate to ≥200 g·ha-1 or tank mixing with sulfentazone at 140 g·ha-1 provided ≥90% Palmer amaranth control for at least 6 WAA. Sulfentrazone alone at 70 g·ha-1 controlled Palmer amaranth 77% at 3 WAA, but control dropped to 69% at 6 WAA. Increasing sulfentrazone rate from 70 to 140 or 280 g·ha-1 increased control to >90% at 3 WAA, but did not maintain acceptable control at 6 WAA. Tank mixing sulfentrazone at 140 g·ha-1 with pendimethalin at 1390 g·ha-1 or S-metolachlor at 1280 g·ha-1 controlled Palmer amaranth ≥90 and 84% at 3 WAA and 6 WAA, respectively. The lowest rate of pyroxasulfone (100 g·ha-1) controlled kochia 98% and the control was complete with all other treatments. However, no treatment provided as much as 90% puncturevine control at 3 WAA and the control was commercially unacceptable (<75%) at 6 WAA. No treatment visibly injured sunflower anytime during the season or reduced sunflower plant population.展开更多
为验证75%氟磺唑草胺WG对多年生杂草田旋花的防除效果和持效期,采用大豆播种后苗前土壤喷雾,定期调查的方法进行田间药效试验。结果表明,75%氟磺唑草胺320～440 g a.i./hm2,兑水750 L/hm2喷雾,药后40 d对田旋花的株防效为68.4%～98.3%,...为验证75%氟磺唑草胺WG对多年生杂草田旋花的防除效果和持效期,采用大豆播种后苗前土壤喷雾,定期调查的方法进行田间药效试验。结果表明,75%氟磺唑草胺320～440 g a.i./hm2,兑水750 L/hm2喷雾,药后40 d对田旋花的株防效为68.4%～98.3%,第二年对田旋花株防效依然能达到45.3%～90.1%。展开更多
文摘A preliminary study conducted in the central USA near Colby and Hays, Kansas (KS) in 2010 indicated a premix of S-metolachlor & sulfentrazone codenamed F7583 (Broadaxe?) had good potential for use in sunflower (Helianthus annuus L.). Additional studies were conducted in 2011 at Colby, Hays, Manhattan, KS to refine rate and application timing of F7583 for weed control and crop safety. Four rates of F7583 (860, 1100, 1350 and 1840 g·ha-1) were compared to single rates of S-metolachlor and pendimethalin, and applied 21 days preplant versus preemergence (PRE). F7583 at ≥1100 g·ha-1 applied preplant or PRE controlled Palmer amaranth (Amaranthus palmeri S. Wats.) and kochia [Kochia scoparia (L.) Schrad.] ≥95% and 100%, respectively in neutral pH soils. In slightly acidic soils, PRE application of F7583 was more effective against Palmer amaranth and grass weeds compared to preplant application. No benefit was gained by increasing the rate of F7583 from 1100 to 1350 g·ha-1 at either application timing. Puncturevine (Tribulus terrestris L.) control was not commercially satisfactory with F7583 at any rate or time of application. Both S-metolachlor at 1070 g·ha-1 and pendimethalin at 1600 g·ha-1 applied either preplant or PRE were considerably less effective on all three broadleaf weeds compared to F7583 treatments. Individually, S-metolachlor and pendimethalin were more effective when applied PRE compared to preplant application. F7583 did not reduce sunflower plant population or visibly injure sunflower anytime during the season.
文摘Eight field trials (<span style="font-family:Verdana;">2 in 2016, 3 in 2017, 3 in 2018) </span><span style="font-family:Verdana;">were conducted</span><span style="font-family:;" "=""><span style="font-family:Verdana;"> in farmers’ fields with heavy infestations of GR </span><i><span style="font-family:Verdana;">Conyza</span></i><span style="font-family:Verdana;"> <i>canadensis</i></span><span style="font-family:Verdana;"> (Canada fleabane, horseweed or </span><span style="font-family:Verdana;">marestail</span><span style="font-family:Verdana;">) </span></span><span style="font-family:;" "=""><span style="font-family:Verdana;">to evaluate glyphosate (900 g ae ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">) plus </span><span style="font-family:Verdana;">saflufenacil</span><span style="font-family:Verdana;"> (25 g ai ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">), 2,4-D ester (500 g ai ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">) or paraquat (1100 g ai ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">) applied </span><span style="font-family:Verdana;">preplant</span><span style="font-family:Verdana;"> (PP) as 2-way </span><span style="font-family:Verdana;">tankmixes</span><span style="font-family:Verdana;">, or in 3-way </span><span style="font-family:Verdana;">tankmixes</span><span style="font-family:Verdana;"> with sulfentrazone (140 g ai ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">), flumioxazin (107 g ai ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">) or metribuzin (400 g ai ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">)</span><span><span style="font-family:Verdana;"> for the glyphosate-resistant (GR) </span><i><span style="font-family:Verda
文摘A field study was conducted at two locations in Kansas, USA in 2011 and 2012 to test weed control efficacy and crop response to preemergence-applied pyroxasulfone alone and in combination with sulfentrazone in sunflower. Treatments included three rates of pyroxasulfone (100, 200 and 400 g·ha-1) applied alone and tank-mixed with sulfentrazone at 70, 140 and 280 g·ha-1. Commercial standards sulfentrazone at 140 g·ha-1 + pendimethalin at 1390 g·ha-1 and sulfentrazone at 140 g·ha-1 + S-metolachlor at 1280 g·ha-1 were also included. Pyroxasulfone at 100 g·ha-1 controlled Palmer amaranth 87% at 3 weeks after application (WAA), but control decreased to 76% at 6 WAA. Increasing pyroxasulfone rate to ≥200 g·ha-1 or tank mixing with sulfentazone at 140 g·ha-1 provided ≥90% Palmer amaranth control for at least 6 WAA. Sulfentrazone alone at 70 g·ha-1 controlled Palmer amaranth 77% at 3 WAA, but control dropped to 69% at 6 WAA. Increasing sulfentrazone rate from 70 to 140 or 280 g·ha-1 increased control to >90% at 3 WAA, but did not maintain acceptable control at 6 WAA. Tank mixing sulfentrazone at 140 g·ha-1 with pendimethalin at 1390 g·ha-1 or S-metolachlor at 1280 g·ha-1 controlled Palmer amaranth ≥90 and 84% at 3 WAA and 6 WAA, respectively. The lowest rate of pyroxasulfone (100 g·ha-1) controlled kochia 98% and the control was complete with all other treatments. However, no treatment provided as much as 90% puncturevine control at 3 WAA and the control was commercially unacceptable (<75%) at 6 WAA. No treatment visibly injured sunflower anytime during the season or reduced sunflower plant population.
文摘为验证75%氟磺唑草胺WG对多年生杂草田旋花的防除效果和持效期,采用大豆播种后苗前土壤喷雾,定期调查的方法进行田间药效试验。结果表明,75%氟磺唑草胺320～440 g a.i./hm2,兑水750 L/hm2喷雾,药后40 d对田旋花的株防效为68.4%～98.3%,第二年对田旋花株防效依然能达到45.3%～90.1%。
