Effects of soil type and tillage practice on atrazine transport through intact soil cores

Adsorption and mobility of glyphosate in different soils under no-till and conventional tillage

“…There was no significant difference in the OC between tillage practices. NT generally increases organic matter (OM) content in the superficial layer of 0-5 cm depth (Montoya et al, 2006). However this can invert as depth increases yielding no net change between systems since the OC contents become higher at 15 cm depth in CT management while they decrease in NT (VandenBygaart and Angers, 2006;Montoya et al, 2006).…”

“…NT generally increases organic matter (OM) content in the superficial layer of 0-5 cm depth (Montoya et al, 2006). However this can invert as depth increases yielding no net change between systems since the OC contents become higher at 15 cm depth in CT management while they decrease in NT (VandenBygaart and Angers, 2006;Montoya et al, 2006). Since the soil samples in this study were taken from the first 15 cm of the top soil, the homogenization of the samples might have masked any differences between tillage systems.…”

Relação da velocidade de escoamento da solução e do comprimento da coluna de solo com os parâmetros de transporte de potássio em um latossolo e um neossolo

“…Muitos desses trabalhos analisaram o movimento de nutrientes ou metais pesados no solo utilizando soluções uni ou multiespécie (Matos et al, 1999;Araújo et al, 2003;Alcântara & Camargo, 2010); outros foram desenvolvidos empregando diretamente as águas residuárias comumente aplicadas no solo (Dontsova et al, 2006;Ferreira et al, 2006;Anami et al, 2008). Vários estudos de deslocamento de substâncias químicas no solo, como agrotóxicos (Barizon et al, 2006;Montoya et al, 2006;Raymundo et al, 2009) e reguladores de crescimento vegetal (Milfont et al, 2008), são realizados utilizando colunas de lixiviação. O movimento de microrganismos no solo também tem sido estudado em ensaios com colunas (Chu et al, 2003;Guber et al, 2005;Rockhold et al, 2005).…”

Ability of Single-Rate Models to Predict Solute Distribution Coefficients in Systems with Heterogeneous Sorption Kinetics

“…By using a single-rate model to simulate cases with multirate sorption behavior, K was adjusted to fit the leftward shift, and the nonequilibrium parameters were mainly adjusted to better describe the tail of the curve. If K is fixed to its true value, single-rate models may not be able to adequately describe the BTCs (Chen and Wagenet 1997;Montoya et al 2006;Johnson et al 2009;Kempf and Brusseau 2009;Brusseau et al 2012;Akyol 2015). Figure 3 shows that, for a given m and n , changes in the fitted K f increased nonlinearly with the solute residence time (LR/v o ), where R is determined based on the fitted K f .…”