Botrel, Neide, Dalmo Lopes de Siqueira, João Chrisóstomo Pedrosa Neto, and Miralda Bueno de Paula. 1991. “Effect of Phosphorus Sources, Levels and Application Methods on Pineapple Culture”. Pesquisa Agropecuaria Brasileira 26 (6):907-12. https://doi.org/10.1590/S1678-3921.pab1991.v26.3421.