Variation in yield gap induced by nitrogen, phosphorus and potassium fertilizer in North China Plain.

PLoS One · 2013 · PMC3861355 · PMID 24349204

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a decreasing trendno p-value reported

For wheat and maize yield, a significant increasing trend over time was found in the NPK-treated plots and a decreasing trend in the NK-treated plots.

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an increasing trendno p-value reported

In addition, the soil available K gap between the NPK and NP plots during maize growth season showed an increasing trend with the omission of K, but the differences were not significant ( Fig. 4c ).

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