1 Subjects: “...soil fertility...”

2 Subjects: “...and soil fertility index...”

3 Subjects: “...soil fertility...”

4 Subjects: “...soil fertility...”

5 Subjects: “...soil fertility...”

6 Subjects: “...soil fertility...”

7 “..., including carbon, nutrients, and water cycling. There are growing concerns regarding soil fertility...”

8 “... deterioration in soil fertility, environment, and irrational use of natural resources. At the same time...”

9 “..., while revaluing local resources. In the case of northern Ecuador, in spite of the limited soil fertility...”