Melo, E. F. R. Q., Junior, P. R., Prevedello, B. M. S., & Koehler, H. S. (1992). Evaluation of zinc levels in the soil and in bean plants. Pesquisa Agropecuaria Brasileira, 27(3), 373–380. https://doi.org/10.1590/S1678-3921.pab1992.v27.3658