Sampaio, E.V. de S.B. and Salcedo, I.H. 1991. Nutrient cycling in sugarcane. V. Potassium balance during four cropping periods. Pesquisa Agropecuaria Brasileira. 26, 9 (Sep. 1991), 1323–1335. DOI:https://doi.org/10.1590/S1678-3921.pab1991.v26.3472.