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Samuels, G. and Alexander, A.G. 1969. Influence of Variable Manganese and Silicon on the Nutrition, Sugar Production, and Enzyme Activity of Immature Sugarcane. The Journal of Agriculture of the University of Puerto Rico. 53, 1 (Jan. 1969), 14–27. DOI:https://doi.org/10.46429/jaupr.v53i1.11173.