Alves, A. C., Brauner, J. L., Zonta, E. P., Cordeiro, D. S., & Corrêa, L. A. V. (2014). Diagnosis of foliar potassium in saccharine sorghum: identification of the best plant organs and growth stage for sampling. Pesquisa Agropecuaria Brasileira, 21(7), 685–690. https://doi.org/10.1590/S1678-3921.pab1986.v21.14867