Alves, R.N.B. and Ventorim, N. 1991. Macro and micronutrients variation in function of NPKMg levels in plant rubber in the nursery. Pesquisa Agropecuaria Brasileira. 26, 1 (Jan. 1991), 137–147. DOI:https://doi.org/10.1590/S1678-3921.pab1991.v26.3172.