A sonic root detector for revealing tree coarse root distribution.

Sci Rep · 2020 · PMC7228922 · PMID 32415146

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highly significantno p-value reported

A highly significant correlation was observed between the coarse root biomass distribution and the sonic speed within 30 cm of soil depth, but this correlation decreased with increasing distance from the trunk, up to 120 cm.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.