Water and Solute Transport in a Cultivated Silt Loam Soil: 1. Field Observations

Abstract

ated with soil type, vadose zone flow and transport processes are also affected by such external factors as tillage Vadose zone flow and transport processes are known to be strongly practices.

Two-dimensional modelling of preferential water flow and pesticide transport from a tile-drained field

“…This was not done here in view of our aim to compare the effects of the different conceptual approaches to modelling preferential flow and transport. An alternative approach for model comparison would be to allow separate parameterizations for each approach using inverse modelling (e.g., Köhne et al, 2004;Coquet et al, 2005). While this is possible at least in theory, practical problems with ill-posedness are to be expected for studies of the type considered here, involving a relatively large spatial scale with many different soil materials, as well as alternative conceptualizations and numbers of unknown parameters (see review by Šimůnek et al, 2003).The dual-permeability and dual-porosity approaches in this study captured the dynamics in measured pesticide concentrations quite well.…”

Effects of agricultural practices on hydraulic properties and water movement in soils in Brittany (France)

“…size and shape) and location of the clods within the soil profile. For example, such an approach has been successfully carried out by Coquet et al (2005b). However, this approach is cumbersome because all the fine structures must be identified and mapped.…”

Dye tracer infiltration in the plough layer after straw incorporation

“…Coquet et al (2005) studied the impact of heterogeneity in soil structure created by agricultural operations on water and bromide transport. They found that compacted clods in the plough layer acted as lowpermeability barriers that diverted water flow towards the less dense regions between the wheel tracks.…”

“…Ankeny et al (1990) and Logsdon and Jaynes (1996) have shown that compaction due to the traffic of farming machines could strongly modify soil hydraulic conductivity. Coquet et al (2005) showed that solute transport in the plough layer is controlled by the location of the compacted clods. Infiltration occurred mainly between these clods.…”