Nitrogen(N)is one of the most important nutrients for plants.Its availability is a major limiting factor in crop productivity and yield.Since the“green revolution”in the middle of the 20th century,the amount of N fertilizer used in agriculture has risen dramatically worldwide,resulting in a significant reduction of nitrogen use efficiency(NUE)and serious economic,environmental,and public health con- Nitrogen (N) is one of the most important nutrients for plants. It’s is a major limiting factor in crop productivity and yield. Since the “green revolution” in the middle of the 20th century, the amount of N fertilizer used in agriculture has risen dramatic worldwide, resulting in a significant reduction of nitrogen use efficiency (NUE) and serious economic, environmental, and public health con-