Alves, Raimundo Nonato Brabo, and Nelson Ventorim. 1991. “Macro and Micronutrients Variation in Function of NPKMg Levels in Plant Rubber in the Nursery”. Pesquisa Agropecuaria Brasileira 26 (1):137-47. https://doi.org/10.1590/S1678-3921.pab1991.v26.3172.