1. Department of Forage Plants and Agrometeorology; Federal University of Rio Grande do Sul (UFRGS); Porto Alegre Rio Grande do Sul Brazil
2. Department of Crop Science; Federal University of Rio Grande do Sul (UFRGS); Porto Alegre Rio Grande do Sul Brazil
3. Department of Crop Production and Protection; Federal University of Paraná (UFPR); Curitiba Paraná Brazil
4. Department of Soil Science; Federal University of Rio Grande do Sul (UFRGS); Porto Alegre Rio Grande do Sul Brazil