Silveira, J.A.G. da and Crocomo, O.J. 1991. Nitrate utilization and carbohydrate distribution as affected by nitrogen and potassium nutrition in sugar cane plants. Pesquisa Agropecuaria Brasileira. 26, 2 (Feb. 1991), 247–257. DOI:https://doi.org/10.1590/S1678-3921.pab1991.v26.3335.