Soil Acidity and Liming

Authored by: T. Jot Smyth

Handbook of Soil Sciences Resource Management and Environmental Impacts

Print publication date:  November  2011
Online publication date:  November  2011

Print ISBN: 9781439803073
eBook ISBN: 9781439803080
Adobe ISBN:

10.1201/b11268-15

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Abstract

About 26% of the global ice-free land surface is occupied by soils with pHw (pH determined in water) values of 6.5 or less, of which two-thirds have potential Al toxicity problems. Subsoil Al problems are estimated to encompass 16% of the ice-free land surface (Eswaran et al., 1997). Naturally, acid soils are found in regions where rainfall exceeds evapotranspiration (Jenny, 1941); H+ and eventually Al+3 replace basic cations lost from exchange sites through excess water transport. Most of the acid soils belong to the Alfisols, Histosols, Oxisols, Spodosols, and Ultisols orders of the U.S. Soil Taxonomy (Buol et al., 1997).

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