Roots compact the surrounding soil depending on the structures they encounter.

Sci Rep · 2019 · PMC6838105 · PMID 31700059

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a decreasing trendno p-value reported

This effect reached up to 1.5 mm into soil, but there was a decreasing trend with increased depth.

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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.