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Bonnet, J.A., Tirado Sulsona, P. and Abruña, F. 1947. Effect of lime-phosphorus and green manure on sweet potatoes and corn grown in acid soils. The Journal of Agriculture of the University of Puerto Rico. 31, 4 (Oct. 1947), 303–321. DOI:https://doi.org/10.46429/jaupr.v31i4.12857.