Soil+Chemistry

=Soil chemistry=

__**Soil** **chemistry:**__ The study of the chemical characteristics of soil. A knowledge of environmental soil chemistry is very important in the prediction of fate of the environment. Once a chemical is exposed to the soil a series of chemical reactions can occur that may increase or decrease toxicity. These reactions include precipitation, dissolution, and oxidation. Understanding these processes enable us to better predict the fate and toxicity of contaminants. []
 * __ Environmental soil chemistry: __**

__**Soil pH:**__ The measure of the acidity or bases in soils. pH is defined as the activity of hydrogen ions in solution. It ranges from 0 to 14, with 7 being neutral. A pH below 7 is acidic and above 7 is basic. Soil pH is a key variable in soil as it controls much chemical process that take place. It specifically affects plant nutrient availability by controlling the chemical forms. The best pH range for most plants is between 6 and 7.5, however many plants have adapted to thrive at pH values outside this range. []

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