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<p>"root". Hiltner postulated the rhizosphere was a region surrounding the plant roots and populated with microorganisms under some degree of control by chemicals released from the plant roots.</p>

<p><big> Chemical interactions </big></p>
<p><big> Chemical availability </big></p>
<p>Plant roots may exude 20-40% of the sugars and organic acids--photosynthetically fixed carbon. <a href="page.php?w=Plant_root_exudates">Plant root exudates</a>, such as <a href="page.php?w=organic_acid">organic acid</a>s, change the chemical structure and the biological communities</p><p>
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