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首页> 外文期刊>Indian Journal of Weed Science >Effect of adjuvants on trifloxysulfuron efficacy and chlorophyll fluorescence of sicklepod, guineagrass, yellow nutsedge and cotton.
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Effect of adjuvants on trifloxysulfuron efficacy and chlorophyll fluorescence of sicklepod, guineagrass, yellow nutsedge and cotton.

机译：佐剂对镰刀类，豚草，黄色马齿and和棉花的三氟乙磺隆功效和叶绿素荧光的影响。

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摘要

Trifloxysulfuron (CGA-362622) at 2.5, 5 and 10 g a. i./ha mixed with non-ionic (0.25% Induce and X-77), organosilicone (0.1% Kinetic and Silwet L-77) and crop oil concentrate (1.0% Agridex and Meth-N-Oil) adjuvants was evaluated for bioefficacy, surface tension, contact angle and chlorophyll fluorescence responses in guineagrass (Panicum maximum L.), sicklepod (Senna obtusifolia L.), yellow nutsedge (Cyperus esculentus L.) and cotton (Gossypium hirsutum L.). The lowest surface tension and contact angle were recorded with L-77 mixed with trifloxysulfuron. Among the six adjuvants, surface tension and contact angle were highest with Meth-N-Oil; however, these differences did not greatly influence herbicide efficacy. Decreasing or increasing the adjuvant concentrations from 1X to 0.5 or 4X with 10 g/ha trifloxysulfuron had only 2 to 4% variations in surface tension and contact angle compared to recommended rates (X) when data were averaged over adjuvants and concentrations. Adjuvants had no antagonistic effects for trifloxysulfuron activity on any weed species. Phytotoxicity symptoms of trifloxysulfuron on cotton disappeared after two weeks, but plant height and fresh weight were reduced 3 WAT compared to control plants. Reduction in plant height or fresh weight of cotton was similar for different adjuvants mixed with trifloxysulfuron. Guineagrass was less affected by trifloxysulfuron plus adjuvants than yellow nutsedge or sicklepod. Kinetic mixed with trifloxysulfuron was more effective in reducing plant height and fresh weight of guineagrass compared to other adjuvants; however, activities were comparable when data averaged over species and rates for different adjuvants. Chlorophyll fluorescence was reduced in all the species after herbicide application, but the reduction was not consistent with application rates, species and duration of 1, 4, 7 and 14 days after treatment (DAT). Reduction in chlorophyll fluorescence in treated plants of cotton was less than weeds, but followed no particular trend with herbicide rates or adjuvant interaction. Visual mortality of 17, 53 and 36% at 2 WAT in guineagrass, sicklepod and yellow nutsedge, respectively, was not visible in similar reduction in chlorophyll fluorescence, when data were averaged over treatments. Chlorophyll fluorescence may not be an ideal tool to predict herbicidal efficacy of trifloxysulfuron in the test species.
机译：三氟乙磺隆（CGA-362622）的浓度为2.5、5和10 g a。评估i // ha与非离子（0.25％Induce和X-77），有机硅（0.1％Kinetic和Silwet L-77）和农作物浓缩油（1.0％Agridex和Meth-N-Oil）佐剂混合的生物功效，豚鼠（Panicum maximum L.），镰刀类（Senna obtusifolia L.），黄色nuts（Cyperus esculentus L.）和棉花（Gossypium hirsutum L.）的表面张力，接触角和叶绿素荧光响应。 L-77与三氟嘧磺隆混合时记录的最低表面张力和接触角。在六种佐剂中，Meth-N-Oil的表面张力和接触角最高。但是，这些差异并没有很大地影响除草剂的功效。当在佐剂和浓度上对数据进行平均时，与10 g / ha的三氟甲磺隆相比，佐剂浓度从1X降低或增加到0.5或4X时，表面张力和接触角的变化只有2％至4％。佐剂对三氟乙磺隆活性没有任何杂草物种的拮抗作用。两周后，三氟乙磺隆在棉花上的植物毒性症状消失，但与对照植物相比，植物高和鲜重降低了3 WAT。对于混合了三氟磺隆的不同助剂，棉花的株高或鲜重的降低是相似的。豚鼠对三氟乙磺隆加佐剂的影响要小于黄色的八角茴香或镰刀类。与其他佐剂相比，动力学混合三氟嘧磺隆在降低豚鼠的身高和鲜重方面更有效。但是，当不同佐剂的物种和比率的数据取平均值时，活性是可比的。除草剂施用后所有物种的叶绿素荧光均降低，但降低与施用率，物种和处理后1、4、7和14天的持续时间（DAT）不一致。处理过的棉花植物中叶绿素荧光的减少少于杂草，但除草剂比率或佐剂相互作用没有特别的趋势。当将数据平均化处理后，在类似的叶绿素荧光减少下，豚鼠，镰刀和黄色坚果中的2 WAT分别有17、53和36％的视觉死亡率不可见。叶绿素荧光可能不是预测三氟乙磺隆在测试物种中除草功效的理想工具。

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