Drudi, A., & Braga, A. F. (2014). Levels of phosphorus, sulfur and micronutrients on degraded pasture recovery on sandy soils of north of Tocantins state. Pesquisa Agropecuaria Brasileira, 25(9), 1317–1322. https://doi.org/10.1590/S1678-3921.pab1990.v25.19476