Modeling soil organic carbon change across Australian wheat growing areas, 1960-2010.

PLoS One · 2013 · PMC3656038 · PMID 23696813

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a decreasing trendno p-value reported

Model simulations show a decreasing trend in SOC over the last 50 years, mainly attributable to relatively low organic carbon (C) inputs.

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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.