Silveira, Expedito Paulo, Francisco Neto de Assis, Paulo Romeu Gonçalves, and Gilmar Chaves Alves. “Sunflower Planting Date in Southeastern Rio Grande Do Sul”. Pesquisa Agropecuaria Brasileira 25, no. 5 (April 17, 2014): 709–720. Accessed July 8, 2026. https://apct.sede.embrapa.br/pab/article/view/13485.