1. Department of Soil, Plant and Food Sciences, University of Bari Aldo Moro, 70126 Bari, Italy;
2. Selge Network, University of Bari Aldo Moro, 70126 Bari, Italy; and
3. Centro di Ricerca, Sperimentazione e Formazione in Agricoltura “Basile Caramia”, Locorotondo (BA), Italy