Souza, A.F. de and Brasil Sobrinho, M. de O. 1987. NPK effect, in foliar spraying, on the nutrients composition of cotton leaves . Anais da Escola Superior de Agricultura Luiz de Queiroz. 44, 1 (Jan. 1987), 215–243. DOI:https://doi.org/10.1590/S0071-12761987000100011.