Abstract The use of herbicide mixtures has been a common practice in the control of weeds in sugarcane crops. The concern with the interactions between the molecules of different herbicides has been limited to compatibility before application. In this sense, little is known about the interactions between mixed herbicides and the soil. The objectives of this study were to investigate the sorption process of diuron, hexazinone, and sulfometuron-methyl in isolated and mixed conditions to soils under sugarcane cultivation. Kinects and isotherms models were used to understand the behavior of herbicides in the soils. The adsorption time and the sorption capacity of the herbicides had the following order of diuron > hexazinone > sulfometuron-methyl in the dystrophic red Oxisol and diuron > sulfometuron-methyl > hexazinone in the red-yellow Oxisol. Herbicide mixtures reduced the maximum adsorption (qe) in ≈50 (diuron), 56 (hexazinone), and 55% (sulfometuron-methyl) compared isolated tests. Also, herbicide mixtures reduced the sorption rate (Kf) 24 (diuron), 89 (hexazinone), and 66% (sulfometuron-methyl) compared to conditions isolated tests. Desorption process was higher for herbicides when mixed in binary and ternary condition. The sorption and desorption of hexazinone in soils is most affected by mixing with other herbicides. Sulfometuron-methyl promotes greater reduction in the sorption of diuron (≈33%) compared to hexazinone (≈21%). The mixture between diuron, hexazinone, and sulfometuron-methyl increases the availability of these herbicides in the aqueous phase of the soil allowing the use of lower rates in the application compared to isolated applications. Higher availability also indicates a greater potential for environmental contamination via leaching or surface runoff.

中文翻译：

---

除草剂混合物影响甘蔗种植土壤中的吸附过程

摘要 使用除草剂混合物已成为控制甘蔗作物杂草的常见做法。对不同除草剂分子之间相互作用的关注仅限于应用前的相容性。从这个意义上说，人们对混合除草剂与土壤之间的相互作用知之甚少。本研究的目的是调查敌草隆、六嗪酮和甲基磺草隆在分离和混合条件下对甘蔗种植土壤的吸附过程。Kinects 和等温线模型用于了解土壤中除草剂的行为。除草剂的吸附时间和吸附能力在营养不良的红色Oxisol中为敌草隆>六嗪酮>甲基磺草隆，敌草隆>甲基磺草隆> 红黄色 Oxisol 中的六嗪酮。与孤立试验相比，除草剂混合物在 ≈50（敌草隆）、56（己嗪酮）和 55%（甲基磺草隆）中降低了最大吸附量 (qe)。此外，与条件隔离测试相比，除草剂混合物降低了 24（敌草隆）、89（己嗪酮）和 66%（甲基磺草隆）的吸附率 (Kf)。在二元和三元条件下混合时，除草剂的解吸过程更高。六嗪酮在土壤中的吸附和解吸受与其他除草剂混合的影响最大。与六嗪酮 (≈21%) 相比，甲基磺草隆 (≈33%) 促进了敌草隆 (≈33%) 的吸附减少。敌草隆、六嗪酮的混合物，和甲基磺草脲增加了这些除草剂在土壤水相中的可用性，与单独施用相比，允许在施用中使用较低的用量。更高的可用性还表明通过浸出或地表径流造成环境污染的可能性更大。