1. Department of Agronomy, Maringá State University (UEM), Maringá, Paraná, Brazil
2. Department of Crop and Soil Sciences, North Carolina State University, Raleigh, North Caroline, USA
3. Soil Fertility Supervisor, Portal Agro, Paragominas, Pará, Brazil
4. Chair of Soil Science, Mohammed VI Polytechnic University, Ben Guerir, Rehamna, Morocco
5. Department of Soil Science and Natural Resources, Santa Catarina State University (CAV-UDESC), Lages, Santa Catarina, Brazil
6. Department of Soil, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul, Brazil