Souza, I.A. de et al. 2016. Forage mass, chemical composition and leaf chlorophyll index of signal grass and organic matter in soil under increasing levels of nitrogen. Semina: Ciências Agrárias. 37, 3 (Jun. 2016), 1505–1514. DOI:https://doi.org/10.5433/1679-0359.2016v37n3p1505.