1. Univ. of Basilicata Crop Systems, Forestry, Environmental Sciences Via Ateneo Lucano 10 Potenza 85100 Italy
2. Crop and Soil Sciences Michigan State Univ. East Lansing MI 48823
3. Lanscape and Agroforestry Systems Univ. of Padua Viale Dell'università 16 Legnaro 35020 Italy
4. Fac. Sciences Univ. of Lisboa Lisbon 7600851 Portugal
5. Faculty of Sciences Univ. of Lisboa Lisbon 7600851 Portugal