[1]
Sfredo, G. et al. 1983. 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. 40, 2 (Jan. 1983), 1189–1218. DOI:https://doi.org/10.1590/S0071-12761983000200021.