1. Department of Agronomic and Environmental Sciences, Federal University of Santa Maria, Frederico Westphalen, Brazil
2. Department of Agronomy, Federal Technological University of Parana, Santa Helena, Brazil
3. Department of Soils, Federal University of Santa Maria, Santa Maria, Brazil
4. Department of Forest Sciences, Federal University of Santa Maria, Santa Maria, Brazil
5. Faculty of Science and Technology, Free University of Bolzano, Bolzano, Italy
6. Department of Biology, Federal University of Santa Maria, Natural Science Centre, Santa Maria, Brazil