SFREDO, G.J.; SARRUGE, J.R.; HAAG, H.P. Absorption of nutrients by two cultivars of sunflowers (Helianthus annuus L.) under field conditions: IV. Acumulation of the micronutrients . Anais da Escola Superior de Agricultura Luiz de Queiroz, Piracicaba, Brasil, v. 40, n. 2, p. 1219–1245, 1983. DOI: 10.1590/S0071-12761983000200022. Disponível em: https://periodicos.usp.br/aesalq/article/view/4939.. Acesso em: 3 jun. 2024.