Assessing and Modifying Ca and Al Levels in Acid Subsoils

  • J. M. McCray
  • M. E. Sumner
Part of the Advances in Soil Science book series (SOIL, volume 14)


Subsoil acidity is a major problem in many parts of the world, particularly on highly weathered soils. In addition, subsoil acidity has been reported in some areas where the acidity is derived from the parent material rather than advanced weathering processes. The restricted rooting zone that results from excessive aluminum (Al) or insufficient calcium (Ca) in these soils becomes particularly acute during dry periods because the moisture in the subsoil is beyond the reach of roots. These soils are usually located in areas receiving adequate annual rainfall, but with a growing season during which drought conditions frequently occur. Much of the rainfall received during the growing season in these areas comes in the form of intense thunderstorms, resulting in a higher percentage of water being lost as runoff, which further exacerbates the problem.


Root Growth Nutrient Solution Soil Solution Acid Soil Subterranean Clover 
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© Springer-Verlag New York, Inc. 1990

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  • J. M. McCray
  • M. E. Sumner

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