Mota, Fernando Silveira da. “A Drought Index for Soybeans; A Contribution to a Soybean Yield Prediction Model for Rio Grande Do Sul, Brazil”. Pesquisa Agropecuaria Brasileira 16, no. 3 (April 15, 2014): 371–383. Accessed July 8, 2026. https://apct.sede.embrapa.br/pab/article/view/16935.