Zinc
The mean Zn value was close to that of Millán et al.
(1983). However, Andreu and Gimeno-García (1996)
and Campos (1997) reported highest mean values in
agricultural soils of the Spanish Mediterranean region.
The Zn concentration in agricultural soils varies from
10 to 300 mg kg-1. It is abundant in sedimentary materials
and clayey soils (Kabata-Pendias and Pendias, 2001),
such as alluvial and alluvial-colluvial soils. In this
work, no plots exceeded the reference value of Pérez
et al. (2002) for agricultural soils and plots contained
less Zn than the maximum permissible concentration
(Kabata-Pendias and Pendias, 2001).