The effects of time of incubation on the relation between charge and pH of soil

M. L. Mora, N. J. Barrow

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Samples of two Andisols and two Ultisols from southern Chile were incubated with acid or with lime for up to 60 d at 25°C or for 1 day at 40°C or at 60°C. The changes in positive and negative charge were measured. The Andisols reacted slowly at 25°C. They lost protons to the solution at high pH, thus increasing the negative charge on the soils and decreasing the pH of the solution. They gained protons at low pH, thus increasing the positive charge on the soils and increasing the pH of the solution. The Ultisols reacted more quickly but again charge and pH changed through time. For all samples, the rate of reaction was increased by incubating at 60°C. Brief incubation at 60°C produces a similar relation to that obtained after longer incubation at 25°C. This provides a convenient means by which measurements can be made more quickly.

Original languageEnglish
Pages (from-to)131-136
Number of pages6
JournalEuropean Journal of Soil Science
Issue number1
Publication statusPublished - 1 Jan 1996
Externally publishedYes


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