[1] Univ Georgia, Coll Engn, Athens, GA 30602 USA
[2] Univ Padua, Dipartimento Agron Anim Alimenti Risorse Nat & Am, Agr, I-35020 Legnaro, Pd, Italy
[3] Univ Padua, Dipartimento Ingn Civile Edile & Ambientale, I-35131 Padua, Italy
[4] Univ Georgia, Dept Crop & Soil Sci, Tifton, GA 31793 USA