The aim of this study was to evaluate the effects of soil organic matter on the sorption and desorption of glyphosate in three soils with different mineralogical attributes. The experiments were carried out at the Laboratório de Ecotoxicologia of the Centro de Energia Nuclear na Agricultura (CENA/USP), Piracicaba, SP (Brazil). The soils were classified as: Rhodic Kandiudalf (NVef), Anionic Acrudox (LAw) and Typic Humaquept (G). In order to evaluate the influence of organic matter on the ghyphosate sorption, the soils […]

Imazaquin herbicide is an organic molecule presenting ionizable functional groups, with its sorption depending on soil pH and electrical charges. In this research, sorption of imazaquin was evaluated on an Anionic Acrudox at different soil depths and pH values. Radiolabelled (14C) molecules were employed to study imazaquin sorption, which was estimated by the difference between applied concentration and that remaining in solution. The sorption data were fitted to Freundlich equation to determine the sorption coefficient values (Kf), which were, overall, […]

The effect of rhizosphere soil addition on ametryn degradation rate was evaluated. The 14CO2 release rate from sterile and non-sterile samples of a sandy soil was compared with the same soil amended with 10% rhizosphere soil from a sugar-cane plantation, treated or not with ametryn. Sterilized soils showed very low 14CO2 release as compared with non-sterilized soil. When mineralization of non-amended soil was compared with rhizosphere soil amended from treated and non-treated fields, 3.5 and 1.7 fold increases of mineralization, […]