Junior, Adilson de Oliveira, Luís Ignácio Prochnow, and Dirceu Klepker. 2008. “Agronomic Effectiveness of Phosphate Rock Evaluated in Soybean Crop”. Pesquisa Agropecuaria Brasileira 43 (5):623-31. https://doi.org/10.1590/S1678-3921.pab2008.v43.177.