1. Department of Plant Mineral Nutrition, Embrapa Soja, Londrina, Paraná State, Brazil
2. Department of Crop Science, State University of Londrina (UEL), Londrina, Paraná State, Brazil
3. Department of Crop Science, São Paulo State University, Botucatu, São Paulo State, Brazil
4. Department of Soil Science, São Paulo State University, Jaboticabal, São Paulo State, Brazil