It is well known that soils in the study area are rich in Fe and Mn salts [17,29,61]. Therefore, Fe–Mn high correlation may be related to the natural high levels of these elements in the soil [17,29,61].
It is well known that soils in thestudy area are rich in Fe and Mn salts [17,29,61]. Therefore, Fe–Mnhigh correlation may be related to the natural high levels of these elementsin the soil [17,29,61].