Reversibility of glyphosate sorption in pampean loess-derived soil profiles of central Argentina

MARTÍN GRAZIANO; CAROLINAPORFIRI; ANA E. TUFO; JORGELINA C.MONTOYA; MARIA DOS SANTOS AFONSO

CHEMOSPHERE

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2022 vol. 312 p. 1 - 10

0045-6535

There is a growing concern about glyphosate´s behavior in the environment. Herbicide behavior in soils greatly depends on adsorption-desorption phenomena, which have shown great variability in soils, although the reversibility of this process has been less examined. The adsorption-desorption behavior of glyphosate was measured on representative soil profiles of the northeast region of Argentinean Pampas, a semi-arid crop cultivating region. Two soil profiles samples (P1 and P2, both Entic Haplustoll) were collected and segmented into depth increments of 0–10, 10–20, 20–40, 40–60, 60–80, and 80–100 cm. Batch adsorption/48 h-desorption isotherms were performed in a controlled setup. Soil samples had a high sand content (77–92%), and a low content of clay (