Temporal and spatial variations of net anthropogenic nitrogen inputs (NANI) in the Pearl River Basin of China from 1986 to 2015.

PLoS One · 2020 · PMC7010255 · PMID 32040490

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a decreasing trendno p-value reported

The largest input of fertilizer N was observed in the ZSJ sub-basin, though it showed a decreasing trend from 9750.85 kg N km -2 in 1986 to 6026.86 kg N km -2 in 2015, reflecting a decline of agricultural activities in the region over this period.

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an increasing trendno p-value reported

The temporal variation of each NANI component is shown in S1 Fig , indicating an increasing trend of fertilizer N application, atmospheric N deposition, and net food and feed N import during 1986 to 2015 (Pearson correlation test, R 2 = 0.990, 0.953, 0.831, p <0.05), although there was a slight fluctuation in some years.

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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.