A meta-analysis of the effects of nitrogen fertilizer application on maize (<i>Zea mays</i> L.) yield in Northwest China.

The increase in maize yield upon nitrogen addition was the highest in Gansu Province, and showed a decreasing trend with the rise in average annual temperature, but did not change significantly with the average annual precipitation.

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This study showed that with the increase of nitrogen application, the yield increase effect of maize showed a trend of increasing and then decreasing, and the highest value of the yield increase effect appeared in the nitrogen application of 175–225 kg·ha -1 .

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With increasing soil AK content, the yield-increasing effects of nitrogen application showed an increasing trend, and the maximum yield-increasing effect [53.50% (95% CI, 47.09%–60.35%)] was noted at ≥ 170 mg·kg -1 .

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