High yield of protein-rich forage rice achieved by soil amendment with composted sewage sludge and topdressing with treated wastewater.

Sci Rep · 2020 · PMC7311477 · PMID 32576900

Europe PMC DOI

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a clear trendno p-value reported

Further, Cd likely increased due to CSS application, while As concentration did not show a clear trend.

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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.