Carvalho, Sylvio Romero de, et al. “Effects of Irrigation and Soil Fertilization on Two Cultivars of Elephantgrass ( Pennisetum Purpureum)”. Pesquisa Agropecuaria Brasileira, vol. 10, no. 4, Apr. 2014, pp. 23-30, https://doi.org/10.1590/S1678-3921.pab1975.v10.17071.