Filho, M.B.D. et al. 1992. Concentration, uptake and use efficiency of N, P and K in <i>Panicum maximum</i> jacq. cv. Tobiatã under water stress. Pesquisa Agropecuaria Brasileira. 27, 3 (Mar. 1992), 381–387. DOI:https://doi.org/10.1590/S1678-3921.pab1992.v27.3659.