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Vidal, A.A. and Neptune, A.M.L. 1983. Availability of some potassium sources by using sweet sorghum (Sorghum bicolor (L.) Moench) . Anais da Escola Superior de Agricultura Luiz de Queiroz. 40, 2 (Jan. 1983), 1333–1370. DOI:https://doi.org/10.1590/S0071-12761983000200027.