SFREDO, G.J.; SARRUGE, J.R.; HAAG, H.P. Absorption of nutrients by two cultivars of sunflower plants (Helianthus annus L.) under field conditions: III. Acumulation of the macronutrients . Anais da Escola Superior de Agricultura Luiz de Queiroz, Piracicaba, Brasil, v. 40, n. 2, p. 1189–1218, 1983. DOI: 10.1590/S0071-12761983000200021. Disponível em: https://www.revistas.usp.br/aesalq/article/view/4938.. Acesso em: 17 may. 2024.