1. Postgraduate Program in Soil Science and Plant Nutrition, Federal University of Viçosa, Viçosa, Brazil
2. Postgraduate Program in Agronomy, Federal University of Goiás, Goiânia, Goiás, Brazil
3. Posgraduate Program in Enviromental Sciense, University of Brasília, Brasília - Brazil
4. Postgraduate Program in Agrarian Sciences, Federal University of the Recôncavo of Bahia, Bahia, Brazil
5. Professor of Center of Agrarian Sciences Environmental and Biological of Federal, University of Recôncavo of Bahia, - Bahia, Brazil