1 Subjects: “...nitrogen use efficiency...”

2 Subjects: “...nitrogen surplus...”

3 Subjects: “...nitrogen metabolism...”

4 Subjects: “...nitrogen fertilizer rate...”

5 Subjects: “...nitrogen fertilization...”

6 Subjects: “...nitrogen use efficiency...”

7 Subjects: “...nitrogen metabolism...”

8 Subjects: “...nitrogen forms...”

9 Subjects: “...nitrogen...”

10 Subjects: “...nitrogen use efficiency...”

11 Subjects: “...nitrogen balance index...”

12 Subjects: “...liquid nitrogen...”

13 Subjects: “...nitrogen...”