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Gleying<br />
Gleying is the extreme outcome or<br />
result of reduction by anaerobic<br />
bacterium.<br />
These bactirum do not use oxygen<br />
but a process called electron<br />
transfer respiration – they use the<br />
electrons from Fe ++ (ferrous iron) for<br />
energy and create Fe +++ (ferric iron)<br />
in the process.<br />
In this case the soil develops a blue<br />
grey colour.<br />
<strong>Soil</strong>s that develop this colour are<br />
usually saturated for prolonged periods<br />
of time during the year.<br />
Blue grey colours typical of the<br />
Gleysolic order
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