Santos, Gabriel A., et al. “Effects of Stillage on Soil PH, Germination Rate and Potassium Accumulation in Corn”. Pesquisa Agropecuaria Brasileira, vol. 16, no. 4, Apr. 2014, pp. 489-93, https://doi.org/10.1590/S1678-3921.pab1981.v16.16980.