1 Subjects: “...Environmental Efficiency...”

2 Subjects: “...N efficiency...”

3 Subjects: “...energy efficiency improvement...”

4 Subjects: “...land use efficiency...”

5 Subjects: “...efficiency ranking...”

6 Subjects: “...land economic efficiency...”

7 Subjects: “...resource use efficiency...”

8 Subjects: “...technical efficiency...”

9 Subjects: “...Chinese provincial input efficiency...”

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

11 Subjects: “...efficiency...”