From: Characterizing soils and the enduring nature of land uses around the Lake Chamo Basin in South-West Ethiopia
Category
Fe
Zn
Mn
Cu
mg/kg soil
Low (deficient)
0–2.5
0–0.5
< 1
0–0.4
Marginal
2.6–4.5
0.6–1
–
0.4–0.6
High (sufficient)
> 4.5
> 1
> 0.6
Toxic level