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首页> 外文会议>Symposium on Pesticide Formulations and Application Systems: A New Century for Agricultural Formulations, Twenty First Volume, Oct 24-26, 2000, Orlando, Florida >Sulfosulfuron Efficacy Is Affected by Surfactants, pH of Spray Mixture, and Salts
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Sulfosulfuron Efficacy Is Affected by Surfactants, pH of Spray Mixture, and Salts

机译：表面活性剂，喷雾混合物的pH值和盐会影响磺胺磺隆的功效

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摘要

Sulfosulfuron {l-(4,6-dimethoxypyrimidin-2-yl)-3-[(2-ethanesulfonyl-imidazo[l,2-a]pyridine-3-yl)]sulfonylurea} must be applied with an adjuvant for effective postemergent weed control. Experiments were conducted to determine Sulfosulfuron phytotoxicity to green foxtail (Setaria viridis L.) as influenced by surfactant chemistry, surfactant hydrophilic/lipophilic balance (HLB), spray mixture pH, and common nitrogen fertilizers. Regardless of accompanying surfactant chemistry, surfactant HLB, and nitrogen fertilizers, Sulfosulfuron efficacy to green foxtail was greatly enhanced when applied in alkaline spray mixture (pH 7.4-8.2) compared to pH 4.0-5.7 unbuffered spray mixture. Secondary alcohol ethoxylate surfactants increased Sulfosulfuron efficacy as HLB of these surfactants increased from 8.3 to 17.4 in unbuffered and buffered spray mixtures. The optimum HLB of various block copolymer surfactants for Sulfosulfuron was from 9.0 to 13.0. In unbuffered spray mixture, ammonium nitrate at 0.25% w/v had no effect or antagonized Sulfosulfuron phytotoxicity, especially when applied with block copolymer surfactants. However, urea fertilizer at 0.25% w/v enhanced herbicide efficacy, regardless of surfactants. Commercial 28% N liquid fertilizer (urea/ammonium nitrate solution) also increased Sulfosulfuron efficacy with most surfactants, especially in unbuffered spray mixtures. In spray mixtures buffered above pH 7, the effects of surfactant HLB and nitrogen fertilizers on Sulfosulfuron efficacy were less evident. Spray droplet spread and droplet drying time did not relate to Sulfosulfuron efficacy. These data demonstrate a potential for optimizing Sulfosulfuron efficacy by carefully selecting surfactant chemistry, surfactant HLB, addition of proper nitrogen fertilizer, and by regulating the pH of the spray mixture.
机译：磺磺隆{1-（4,6-二甲氧基嘧啶-2-基）-3-[（2-乙磺酰基咪唑并[1,2-a]吡啶-3-基）]磺酰脲}必须与佐剂一起使用，以有效地产生芽后杂草防治。进行实验以确定磺草隆对绿色狐尾草（Setaria viridis L.）的植物毒性，受表面活性剂化学，表面活性剂亲水/亲脂平衡（HLB），喷雾混合物pH和常用氮肥的影响。不管伴随的表面活性剂化学，表面活性剂HLB和氮肥如何，与pH 4.0-5.7的非缓冲喷雾混合物相比，在碱性喷雾混合物（pH 7.4-8.2）中施用时，磺胺磺隆对绿狐尾的功效都大大提高。仲醇乙氧基化物表面活性剂增加了磺磺隆的功效，因为这些表面活性剂的HLB在无缓冲和缓冲喷雾混合物中从8.3增加到17.4。各种嵌段共聚物表面活性剂对磺胺磺隆的最佳HLB值为9.0至13.0。在无缓冲喷雾混合物中，0.25％w / v的硝酸铵无作用或拮抗磺胺磺隆的植物毒性，尤其是与嵌段共聚物表面活性剂一起使用时。但是，无论表面活性剂如何，0.25％w / v的尿素肥料都能提高除草剂的功效。商用28％N液体肥料（尿素/硝酸铵溶液）也可提高大多数表面活性剂对磺胺磺隆的功效，尤其是在无缓冲喷雾混合物中。在pH高于7的缓冲喷雾混合物中，表面活性剂HLB和氮肥对磺胺磺隆功效的影响不太明显。喷雾液滴散布和液滴干燥时间与磺胺磺隆功效无关。这些数据证明了通过仔细选择表面活性剂化学性质，表面活性剂HLB，添加适当的氮肥以及调节喷雾混合物的pH值来优化磺胺磺隆功效的潜力。

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