Table 2 Nutrient index with range and remarks.

From: Influence of altitudinal zones on soil nutrient dynamics and fertility constraints in agricultural terrains of Yunnan, China

Interpretation

Value range

Nutrient index classes

References

Low nutrient

0.00–1.50

I

6

Optimum nutrient

1.51–2.50

II

33

High nutrient

 > 2.50

III

34

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