Alexander, A.G. and Samuels, G. 1967. Effects of Variable Calcium and Manganese on the Enzyme, Nucleotide, and Nutrient Constituents of Sugarcane Grown by Sand Culture. The Journal of Agriculture of the University of Puerto Rico. 51, 3 (Jul. 1967), 238–251. DOI:https://doi.org/10.46429/jaupr.v51i3.11239.