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<p>(cations) of <a href="page.php?w=Plant_nutrition">plant nutrients</a>, making them more available to the plant by way of <a href="page.php?w=ion_exchange">ion exchange</a>. Humus allows soil organisms to feed and reproduce and is often described as the "life-force" of the soil.</p>

<p>The most useful functions of humus are in improving <a href="page.php?w=soil_structure">soil structure</a>, all the more when associated with <a href="page.php?w=cations">cations</a> (e.g. <a href="page.php?w=calcium">calcium</a>), and in providing a very large</p><p>
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