Salvador, J.O. et al. 1998. Nutritional deficiency on young guava plants due to the simultaneous omission of two macronutrients. Pesquisa Agropecuaria Brasileira. 33, 10 (Oct. 1998), 1623–1631. DOI:https://doi.org/10.1590/S1678-3921.pab1998.v33.5000.