Plastic Film Mulching Improved Maize Yield, Water Use Efficiency, and N Use Efficiency under Dryland Farming System in Northeast China.

The soil residual 15 N content (%TN) differences between PFM and NM treatments were highly significant ( p < 0.01) at 0–10, 10–20, 30–40, and 60–70 cm depths of the profile ( Figure 1 B). 3.3.

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