Abstract
A more general use of the filter-paper method for measuring soil-water potential over a very wide range of values is advocated, both for in situ and laboratory situations. Using Whatman ® No. 42, both HgCl 2-treated and untreated, filter papers, the calibration curves measured on two different batches two years apart were almost identical and were in good agreement with a curve published previously by other authors. Routine use of the same papers could therefore be made without recalibrating. Examples using the method for constructing water-release curves are given, and other uses are suggested.
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