SORPTION OF INDAZIFLAM IN BRAZILIAN SOILS WITH DIFFERENT pH VALUES

ABSTRACT Pre-emergence herbicides, such as indaziflam, have agronomic efficiency when available in the soil solution, mainly superficial layer (0-10 cm), region with highest concentration of weed seed bank. However, information about sorption indaziflam Brazilian soils still is scarce, since most studies literature were conducted temperate regions. The objective this study was to estimate using high-performance liquid chromatography (HPLC) and bioassay a Latossolo Vermelho-Amarelo (Oxisol) Cambissolo (Inceptisol), at pH values 5.1 6.1. In biossay, Sorghum bicolor used an indicator plant. Quantitative data obtained by HPLC, desorption coefficients determined Freundlich isotherms. Increasing two from 6.1 resulted reductions C50 coefficient values. Desorption, parameter estimated only showed inverse behavior that sorption, is, lowest observed condition sorption. It concluded increase studied reduces influencing recommendations herbicide, both environmental points view. When goal verify presence or absence soils, technique has satisfactory efficiency. Chromatographic assay necessary quantifying herbicide soil.