Effects of Adding Organic Matter to a Red-Yellow Latosol in the Sorption and Desorption of Tebuthiuron

ABSTRACT: Tebuthiuron is one of the most widely used herbicides in the sugarcane culture and its characteristic is the long persistence in soil. When used without knowing its interactions with soil attributes, it can reduce the sustainability of cropping systems and contaminate surface and groundwaters. In this research, by using a high-performance liquid chromatography, the effects of adding organic matter in a Red-Yellow Latosol were evaluated, as for the sorption and desorption of tebuthiuron. It was concluded that there is a direct relation between the sorption of tebuthiuron and the organic matter content in Red-Yellow Latosols and there is an inverse relation for desorption. The hysteresis index was lower in samples with high organic matter content.

摘要：特丁噻草隆（Tebuthiuron）是甘蔗种植中应用最为广泛的除草剂之一，其显著特性为在土壤中持效期漫长。若未厘清其与土壤属性的相互作用便施用该药剂，可能会降低种植系统的可持续性，并污染地表水与地下水。本研究采用高效液相色谱法（high-performance liquid chromatography），针对红黄色砖红壤（Red-Yellow Latosol）中添加有机质的处理，评估了特丁噻草隆的吸附与解吸行为。研究结果表明：特丁噻草隆在红黄色砖红壤中的吸附量与土壤有机质含量呈正相关，而解吸量与有机质含量呈负相关；有机质含量较高的土样，其滞后指数更低。