Moreira, Adônis, Janice Guedes de Carvalho, and Antônio Ricardo Evangelista. 1997. “Levels of Sulfur Effects on Alfalfa Production and Mineral Composition”. Pesquisa Agropecuaria Brasileira 32 (5):533-38. https://doi.org/10.1590/S1678-3921.pab1997.v32.4671.