rhizosphere

rhizosphere

[rahy-zuh-sfeer]
noun
the area of soil that surrounds the roots of a plant and is altered by the plant's root growth, nutrients, respiration, etc.
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Collins
World English Dictionary
rhizosphere (ˈraɪzəʊˌsfɪə)
 
n
the region of the soil in contact with the roots of a plant. It contains many microorganisms and its composition is affected by root activities

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
rhizosphere   (rī'zə-sfîr')  Pronunciation Key 
The soil zone that surrounds and is influenced by the roots of plants. Within the rhizosphere, roots secrete a slimy lubricating substance, called mucigel, that cause the particles of soil to adhere to the roots, assisting in the uptake of water, and encourages the growth of nitrogen-fixing bacteria and other beneficial microorganisms.
The American Heritage® Science Dictionary
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