Abstract

OVER recent years a justifiably large amount of attention has been directed to the role of root exudates in the stimulation of microbial development in the root region. There is, however, the possibility that the importance of exudates in this stimulation has been exaggerated and that some micro-organisms could be stimulated by the mere presence in the soil of a solid structure such as a root. With this possibility in mind, a comparison in colonization was made using live and dead roots and inert solid material (nylon thread) placed in the same soil.

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