Influence of Various Phosphate Fertilizers on Yields of Red Spanish Pineapples in Puerto Rico
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Samuels, G., & Gandía-Díaz, H. (1963). Influence of Various Phosphate Fertilizers on Yields of Red Spanish Pineapples in Puerto Rico. The Journal of Agriculture of the University of Puerto Rico, 47(4), 242–245. https://doi.org/10.46429/jaupr.v47i4.12960

Abstract

A Bayamón sandy clay was used to evaluate various phosphate sources for fertilizing Red Spanish pineapples. The phosphate sources utilized were simple superphosphate, triple superphosphate, raw-rock phosphate, ammonium metaphosphate, diammonium phosphate, calcium metaphosphate, dicalcium metaphosphate, potassium calcium pyrophosphate, and potassium metaphosphate. The results on a plant and a ratoon crop indicated that: 1. There were no significant increases in yield of Red Spanish pineapple for any of the phosphate sources used as compared to the no-phosphate treatment. 2. Yields were significantly lowered over the no-phosphate treatment when diammonium phosphate (20-52-0) was used as a source of phosphate. 3. Mean weight, but not total weight of fruit per acre, was significantly reduced over the no-phosphate treatment when potassium metaphosphate (0-47-28) was used as a source of phosphate.
https://doi.org/10.46429/jaupr.v47i4.12960
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