Optimum soil frost depth to alleviate climate change effects in cold region agriculture.

Sci Rep · 2017 · PMC5359591 · PMID 28322258

Europe PMC DOI

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an interesting trendno p-value reported

Higher nitrate retention ratio by deeper soil frost penetration can be an interesting trend, because soil frost control to manage volunteer potatoes could also allow the alleviation of groundwater pollution by nitrate.

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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.