1. Department of Agricultural Engineering; Federal University of Viçosa; Av. P.H. Rolfs, s/n Viçosa MG 36570-900 Brazil
2. Institute of Biological and Health Sciences; Federal University of Alagoas; Av. Lourival Melo Mota, s/n Tabuleiro do Martins Maceió AL 57072-900 Brazil
3. School of Geography and the Environment; University of Oxford; Oxford UK