1. São Paulo State Univ. (UNESP), College of Agricultural Sciences Botucatu São Paulo Brazil
2. Mato Grosso Federal Institute of Education, Science and Technology Rodovia MT 235, km 12, PO Box 100 78360‐000 Campo Novo do Parecis Mato Grosso Brazil
3. São Paulo State Univ. (UNESP) College of Agricultural Sciences, Dep. of Crop Science Lageado Experimental Farm, PO Box 237 18610‐307 Botucatu São Paulo Brazil
4. São Paulo State Univ. (UNESP) Center for Tropical Roots and Starches Lageado Experimental Farm, PO Box 237 18610‐307 Botucatu São Paulo Brazil