“…In its juice, there is bromelain which can hydrolyze protein, stimulating good digestion in the intestine [ 2 ]. Areas of pineapple cultivation in Asia up to 2020 have been 437,571 ha, while those in Vietnam reached 38,554 ha [ 3 ] and mainly located in the Mekong Delta, e.g., Hau Giang [ 4 ]. On the other hand, pineapple farmers have encountered risks due to low soil fertility and high concentrations of Al 3+ and Fe 2+ toxicities in acid-sulfate soil (ASS), inhibiting plant growth [ 5 ].…”