Performance of 'MD-2' pineapple as affected by magnesium source and rate

In the 21^st century, 'MD-2' has become the pineapple cultivar most widely grown in Puerto Rico. While several experiments have provided data to develop local recommendations for application of nitrogen and potassium, locally generated information is needed to support recommendations for other nutrients. Field research was conducted in southwestern Puerto Rico to determine the effects of two magnesium sources (oxide and sulfate) and rates (0, 15, 30. 45, 60 and 75 kg of Mg ha^‑1). Other mineral nutrients were applied as per recommendations, and common production practices were used. Fruit yield was greatest with 45 kg of Mg ha^‑1 from magnesium sulfate. There were no significant treatment effects on fruit coloration, titratable acidity, and concentration of soluble solids. In general, the use of magnesium sulfate resulted in the highest fruit yields.