The average PFPN increase rate of MNF showed an overall trend of first increasing and then decreasing with increasing nitrogen release period ( Figure 9 a).
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Exploring the Potential of Nitrogen Fertilizer Mixed Application to Improve Crop Yield and Nitrogen Partial Productivity: A Meta-Analysis.
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The sentences
The effect of MNF on PFPN showed a trend of first increasing and then decreasing with increasing elevation.