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Malavolta, E. et al. 1976. Studies on the mineral nutrition of corn: II. efect of rates of N, P, and K on growth, yield and mineral composition of the variety Piranão under controlled conditions . Anais da Escola Superior de Agricultura Luiz de Queiroz. 33, (Jan. 1976), 479–499. DOI:https://doi.org/10.1590/S0071-12761976000100044.