A method for collecting soil percolate and soil solution in the field |
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Authors: | V T Tadros J W McGarity |
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Institution: | (1) Department of Agronomy and Soil Science, University of New England, Armidale, N.S.W., Australia |
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Abstract: | Summary A soil-water extractor is described which uses an absorbent sponge material for sampling soil percolate and solution. Good agreement existed between soil extracts (1:5 soil:water) and extracts obtained from the extractor sponge after equilibration at low water tensions (pF 0–2.5) in the range, 0–100 g/g soil (0–1400 g/ml solution) for solute anions (Cl-, NO2
- and NO3
–, R2 > 0.98), and for ammonium ions (NH4
+, R2=0.93).Percolate was recovered in a field soil in volumes sufficient to permit analysis of constituents. Concentrations of solute Cl- ions in these percolates were similar to those in the added water and in percolate from a zero-tension lysimeter. Poor relationships were obtained in the field between soil solution extracts from the sponge and 1:10 soil water extracts. For the present, the soil extractor may be used for sampling and monitoring movement of percolate and solute fronts, in the wetter range of soil water content. |
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