Maximum soil organic carbon storage in Midwest U.S. cropping systems when crops are optimally nitrogen-fertilized.

PLoS One · 2017 · PMC5332021 · PMID 28249014

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highly significantno p-value reported

For all statistics, we used alpha levels of 0.05 and 0.01 to indicate significant and highly significant results, respectively.

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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.