Tracing nitrate sources with dual isotopes and long term monitoring of nitrogen species in the Yellow River, China.

Sci Rep · 2017 · PMC5561216 · PMID 28819112

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an increasing trendno p-value reported

Although an increasing trend in [NO 3 − –N] is observed over the past three decades, [NO 3 − –N] during the period 2012 to 2014 was lower than the average [NO 3 − –N] during 1989 to 2000.

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