Factors influencing the bioavailability of some selected elements in the agricultural soil of a geologically varied territory: The Campania region (Italy) case study

Bioavailability of some major and trace elements was evaluated in 1,993 topsoil samples collected across Campania region (Southern Italy). A main focus made on Al, Ca, K, Mg, Cu, Tl since they are linked, for different reasons, to agriculture. assessed by an extraction with ammonium nitrate the data were compared pseudo-total concentration determined Aqua Regia digestion. Geochemical maps bioavailable concentrations generated using a multifractal inverse distance weighted (MIDW) interpolation. In addition, spatial distribution patterns percent bioavailability elements, based ratio among fractions, also determined. The median value showed order Ca > K ≫ Mg ≃ Cu Al it represents positive finding terms both agricultural productivity environmental quality. Further, multiple linear regression finally applied unveil any dependence fraction content elements. grain size organic matter later included evaluate their possible role promoting availability alone resulted be poorly able predict variability fraction. addition models expanded predictive capability whereas marginal improvement Tl. This study methodological contribution better understanding processes underlying chemical soil. Considering outcomes obtained, further researches planned include more variables (e.g. soil pH, redox potential, Iron Manganese oxides, etc.) models.