Phosphorus Supply Under Micro-Nano Bubble Water Drip Irrigation Enhances Maize Yield and Phosphorus Use Efficiency.

Alkaline Protease At the 0–15 cm soil depth ( Figure 3 A), both the irrigation method ( p < 0.001) and phosphorus (P) application ( p < 0.01) had a highly significant effect on soil alkaline protease activity.

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Under micro-nano bubble water drip irrigation (I2), PUE demonstrated a decreasing trend with increasing phosphorus application rates, with values of 0.88 kg·kg −1 for P1, 0.65 kg·kg −1 for P2, and 0.52 kg·kg −1 for P3.

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Under the same irrigation method, as P application increased, the P concentrations in roots, leaves, and grains showed an increasing trend.

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