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Publication Date

2-2004

Series Number

4602

Abstract

Productive agriculture increases the concentration of hydrogen ions in soil, which acidifies the soil.

Aluminium is a component of many soil constituents, including clays and oxides, and is also present on the surfaces of soil organic matter. As the concentration of hydrogen ions in soil increases, soil pH decreases, and aluminium starts to dissolve from the soil constituents, increasing the concentration of aluminium ions in soil solution.

As the concentration of aluminium ions in the solution increases, the aluminium in the soil solution becomes increasingly toxic to plant roots, reducing root growth. The smaller amounts of plant roots explore a smaller volume of soil, decreasing the ability of the roots to take up water and nutrient elements from soil, thereby reducing shoot and grain yields of plants growing in the soil.

Number of Pages

16

ISSN

1448-0352

Keywords

Soil acidity, Nitrogen cycle, Agriculture, Hydrogen, Paddocks, Western Australia

Disciplines

Agriculture | Soil Science

Subsurface acidity

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