1. Federal Institute of Education, Science and Technology Farroupilha, Santo Augusto (RS), Brazil
2. Department of Soil Science, Center of Rural Sciences, Federal University of Santa Maria, Santa Maria (RS), Brazil
3. Department of Biology, Center of Natural and Exact Sciences, Federal University of Santa Maria, Santa Maria (RS), Brazil
4. Federal Institute of Rio Grande do Sul, Campus Restinga, Porto Alegre (RS), Brazil