Journal or Book Title
Field-Scale Water and Solute Flux in Soils
Workshop on Field-Scale Water and Solute Flux in Soils
September 24-29, 1989
Soil water infiltration exhibits spatial variability due to both intrinsic soil properties and management effects (e.g. wheel traffic and tillage). The description or prediction of field scale water and solute movement, therefore, requires that the spatial distribution of hydraulic properties be known. Practical measurement of hydraulic properties of unsaturated soil requires both a rapid field technique to sample the necessary number of sites and a straightforward analytical technique for interpreting data. We have designed precision automated tension infiltrometers that enable rapid determination of soil water infiltration. Tension infiltrometers were used to obtain unsaturated infiltration data for chisel-plow, no-till, wheel-trafficked, and non-wheel trafficked management zones. This paper reports means and coefficients of variation for hydraulic conductivities at multiple tensions derived from unconfined infiltration measurements. Mean hydraulic conductivities decreased as tension increased. Trafficked sites had lower values of hydraulic conductivity than non-trafficked sites. The tension infiltrometer is a useful tool for obtaining spatial measurements of field infiltration and unsaturated hydraulic conductivities.
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Ankeny, M. D.; Horton, R.; and Kaspar, T. C., "Field estimates of hydraulic conductivity from unconfined infiltration measurements" (1990). Agronomy Conference Proceedings and Presentations. 72.