1.
Sfredo G, Sarruge J, Haag H. Absorption of nutrientes by two cultivars of sunflower plants (Heliantus annuus L.) under field conditions: II. Micronutrients concentration . An. Esc. Super. Agr. Luiz de Queiroz. 1983;40(2):1165-1187. doi:10.1590/S0071-12761983000200020