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Samuels, G. and González-Vélez, F. 1963. Influence of Nitrogen Sources and Time of Cutting on Yield and Protein Content of Napier (Merker) Grass. The Journal of Agriculture of the University of Puerto Rico. 47, 3 (Jul. 1963), 205–211. DOI:https://doi.org/10.46429/jaupr.v47i3.12954.