[1] Fed Univ Vicosa UFV, Dept Agr Engn, BR-36570900 Vicosa, MG, Brazil
[2] Univ Fed Goias, Coll Agron, Dept Biosyst Engn, BR-74690900 Goiania, GO, Brazil
[3] Fed Univ Technol Parana UTFPR, Biometeorol Study Grp, BR-85660000 Dois Vizinhos, PR, Brazil
[4] Univ Firenze, Dept Agr Food Environm & Forestry, I-50145 Florence, Italy