1. Department of Agricultural Sciences, Federal University of Campina Grande, Pombal 58840-000, PB, Brazil
2. Department of Soil Science, Federal University of Viçosa, Viçosa 36570-900, MG, Brazil
3. Faculty of Agricultural Science, University of Amazonas, Manaus 69067-005, AM, Brazil
4. Department of Soil Science, Federal University of Lavras, Lavras 37200-900, MG, Brazil
5. Agricultural Sciences Center, Federal Rural University of Semi-Arid, Mossoró 59625-900, RN, Brazil
6. Agricultural Sciences Center, State University of Paraíba, Catolé do Rocha 58884-000, PB, Brazil