The use of herbicide mixtures is widely adopted by farmers in agriculture worldwide. Glyphosate and ametryn are herbicides commonly applied in tank mixtures, increasing the spectrum of weed control in sugarcane crops. After application, herbicides can reach the soil layer, which is susceptible to retention, transport, and degradation processes. Herbicide interactions in mixtures may affect their bioavailability and persistence in soil, leading to different behavior in the environment compared to when applied alone. This study evaluated the sorption-desorption and transformation of C-glyphosate and C-ametryn in soil when applied alone or in a tank mixture. The sorption of C-ametryn in soil was increased by 25% when mixed with glyphosate (C-ametryn + glyphosate). This increase in sorption was not evident for C-glyphosate when mixed with ametryn (C-glyphosate + ametryn). The amount desorbed of C-ametryn (20%) applied alone was higher than in a mixture (10%). Both herbicide's mineralization half-live time (MT) was influenced when applied in mixtures. C-glyphosate applied alone showed lower MT (55 days) compared to C-glyphosate + ametryn (119 days). C-ametryn also showed lower MT when applied alone than when applied with glyphosate (>120 days in both cases). These results suggest that the presence of ametryn in mixture with glyphosate decreases the desorption and mineralization of both herbicides, potentially affecting their bioavailability for weed root absorption and degradation in environment.

中文翻译：

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了解草甘膦和莠灭净相互作用的复杂性：土壤保留和转化受其单独和混合物应用的影响


除草剂混合物的使用被世界各地的农业农民广泛采用。草甘膦和莠灭净是常用于罐混剂中的除草剂，扩大了甘蔗作物杂草控制的范围。施用后，除草剂可以到达土壤层，容易发生滞留、运输和降解过程。除草剂混合物中的相互作用可能会影响其生物利用度和在土壤中的持久性，从而导致与单独施用时相比在环境中产生不同的行为。本研究评估了 C-草甘膦和 C-莠灭净单独或在罐中混合施用时在土壤中的吸附-解吸和转化。当与草甘膦混合时（C-莠灭净 + 草甘膦），土壤中 C-莠灭净的吸附量增加 25%。当 C-草甘膦与阿灭净（C-草甘膦 + 阿灭净）混合时，这种吸附增加并不明显。单独施用的C-莠灭净（20%）的解吸量高于混合物（10%）。当以混合物形式施用时，两种除草剂的矿化半衰期（MT）都会受到影响。与 C-草甘膦 + 阿灭净（119 天）相比，单独施用 C-草甘膦的 MT（55 天）较低。单独施用时，C-莠灭净还表现出比与草甘膦一起施用时更低的 MT（两种情况均> 120 天）。这些结果表明，莠灭净与草甘膦的混合物的存在降低了两种除草剂的解吸和矿化，可能影响它们在环境中杂草根部吸收和降解的生物利用度。