Phthalic acid esters in soils from vegetable greenhouses in Shandong Peninsula, East China.

PLoS One · 2014 · PMC3991724 · PMID 24747982

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an increasing trendno p-value reported

The C/N ratio presented an increasing trend with soil depth.

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a decreasing trendno p-value reported

The TOC ranged from 19.3 g/kg to 32.2 g/kg and presented a decreasing trend with soil 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.