1. Department of Agronomy, Universidade Estadual De Maringá, Maringá, Paraná State, Brazil
2. Department of Soil Science and Agricultural Engineering, Universidade Federal Do Paraná, Curitiba, Paraná State, Brazil
3. Department of Soil Science, Universidade Federal Do Rio Grande Do Sul, Porto Alegre, Rio Grande Do Sul State, Brazil
4. Department of Agronomy, Universidade Tecnológica Federal Do Paraná, Campus Santa Helena, Santa Helena, Paraná State, Brazil