This study was conducted to (i) establish the diagnosis and recommendation
integrated system (DRIS) for the macronutrient and micronutrient status of
pineapple at the preflowering stage and (ii) verify the reliability of the
established norms for macronutrients. We collected 86 pineapple leaves at
sites +1 and +3 from 86 fields of pineapples grown in acid sulfate soil (ASS)
and analyzed their nutrient content. Findings revealed the establishment of
12 and 20 nutrient ratios for DRIS norms at pineapple leaf sites +1 and +3.
Based on omission fertilization of N, P, K, Ca, and Mg at the first crop, the DRIS
index of N, P, K, and Mg was inadequate in treatments lacking the corresponding
nutrients, whereas the DRIS index in the treatment fully fertilized
with N, P, K, Ca, and Mg was negative and lower at the +3 leaf position. In
the second crop, the DRIS norms were highly reliable via the negative DRIS
index when fertilizing without N, P, K, Ca, and Mg. By contrast, when fertilizing
with N, P, K, Ca, and Mg, the DRIS index was positive or less negative. The
DRIS norms established that position +3 is robust and suitable for evaluating
the pineapple macronutrient status.