The Effect of Nitrogen Rates on Yields and Nitrogen Use Efficiencies during Four Years of Wheat–Maize Rotation Cropping Seasons

Nitrogen is a major limiting factor to crop production of the intensive wheat ( Triticum aestivum L.)–maize ( Zea mays L.) rotation cropping system in the North China Plain (NCP). This 4‐yr study was to evaluate the effects of N application on soil NO 3 –N dynamics and N use efficiency under sprinkler irrigation in the Beijing region of the NCP. There were four treatments, named CK, N1, N2, N3 with N application of 0, 110, 220, and 330 kg N ha...