1. Postgraduate program in Agronomy, State University of Western Paraná, Marechal Cândido Rondon, Brazil
2. Departamento de Ciencias Vegetales, Facultad de Agronomía e Ing. Forestal, Pontificia Universidad Católica de Chile, Santiago, Chile
3. Agronomy Departament, Educational College of Medianeira, Medianeira, Brazil
4. Agronomy Departament, State University of Western Paraná, Marechal Cândido Rondon, Brazil