1. Agricultural Engineering Department, Federal University of Viçosa (UFV), Av. Peter Henry Rolfs, s.n., Viçosa, MG 36570-900, Brazil
2. Biosystems Engineering Department, College of Agriculture ‘Luiz de Queiroz’, University of São Paulo (ESALQ/USP), Av. Pádua Dias, 11, Piracicaba, SP 13418-900, Brazil