Premium
Solute Movement in a Field Soil
Author(s) -
Van De Pol R. M.,
Wierenga P. J.,
Nielsen D. R.
Publication year - 1977
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1977.03615995004100010008x
Subject(s) - soil science , diffusion , soil water , chloride , water flow , suction , pore water pressure , steady state (chemistry) , hydrology (agriculture) , environmental science , chemistry , geology , geotechnical engineering , thermodynamics , physics , organic chemistry
Solute and water movement was studied under steady‐state flow conditions in a field soil consisting of 70 cm of clay to silty clay over a medium sand. A steady‐state water flow condition was maintained by applying irrigation water at a constant flux of 2 cm per day. During the steady‐state condition some of the water leached into the plot was labelled with chloride and tritium. The positions of the chloride and tritium as functions of soil depth and time were measured by extracting samples of the soil solution with soil suction probes. Extremes in solute displacement occurred at equal and different depths within the plot. An analysis of these measurements indicated that observations of the pore‐water velocity and the apparent diffusion coefficient were log normally distributed. Twenty‐four soil suction probes, used to identify the rate at which a solute was displaced in the soil, will yield an estimate of the mean pore‐water velocity of this soil within a range of approximately ±25% of its true value providing the effects of potential solute‐soil interactions are taken into account.