Temporal and spatial variation of potassium balance in agricultural land at national and regional levels in China.

PLoS One · 2017 · PMC5584956 · PMID 28873448

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a decreasing trendno p-value reported

The K input from human and livestock manure accounted for a substantial proportion of the total K input, but it showed a decreasing trend which was 65.9, 50.9, 42.2 and 36.7% in the 1980s, 1990s, 2000s and 2010s, respectively.

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