Souza, Agnelo de, Marcelo Fernandes de Oliveira, and Vania Beatriz Rodrigues Castiglioni. “The Boron on Sunflower Crop”. Semina: Ciências Agrárias 25, no. 1 (May 19, 2004): 27–34. Accessed February 27, 2026. https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/2216.