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<p>* Plant growth: Plants take up nutrients in the form of ions (e.g. , , , ), and they often take up more <a href="page.php?w=cation">cation</a>s than <a href="page.php?w=anion">anion</a>s, in particular in <a href="page.php?w=legume">legume</a>s. However, plants must maintain a neutral charge in their roots. In order to compensate for the extra positive charge, they will release  ions from the root. Some plants also <a href="page.php?w=Exudate">exude</a> <a href="page.php?w=organic_acid">organic acid</a>s into the soil to acidify the zone around</p><p>
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