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Zinc deficiency on pineapple is the classic crookneck disorder: young leaves emerge small, pale, twisted, and often bent to one side. Zn shares the high-pH lock-up pattern with iron. It is common on coral, calcareous, and heavily limed blocks and on peat where Zn availability drops with dry conditions. Regional priority: Moderate to high on coral, calcareous, and peat soils; specific to certain zones in Peninsular Malaysia, Ivory Coast, and the Philippines.

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When pineapple is most vulnerable

From early vegetative (month 2 or 3) onward. Once distorted leaves form, they do not recover; only new growth after correction is normal.

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How zinc deficiency shows in satellite data

  • Rarely visible at Sentinel scale unless block-wide.
  • Distorted young leaves reduce canopy area over months, causing a slow NDVI shortfall.
  • Confirm on the ground and by D-leaf analysis.

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Field symptoms

  • Small, narrow, pale young leaves in the center whorl
  • “Crookneck” - the whole rosette center bends to one side
  • Twisted or curled leaf tips
  • Rosette compressed and shorter than same-age plants
  • Reduced flowering response to forcing if deficiency is severe
  • Symptoms most visible on new growth after each spray cycle

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Reduce the damage by

  • Foliar zinc sulphate (0.5 to 1%) applied to the leaf axil - repeat every 4 to 6 weeks.
  • Zinc chelate (Zn-EDTA) on high-pH blocks where sulphate re-precipitates.
  • Do not over-lime - keeping pH below 6.0 keeps Zn available.
  • Apply Zn at planting on known deficient blocks - broadcast zinc sulphate at 20 to 30 kg/ha, incorporated.
  • Combine with foliar Fe on high-pH blocks; they usually co-occur.
  • D-leaf analysis - target 8 to 15 ppm Zn in the D-leaf. This is a generic target with no site, soil, cultivar or season qualifier, so it supports inside or outside and no finer grade — see Reading a tissue analysis.

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Set an alert for early warning

Turn the diagnosis into a trigger. Zn deficiency is chronic and pH-driven; schedule sampling and foliar reminders.
Recommended settings for zinc on pineapple:
  • D-leaf sampling reminder - month 6 to 8, include Zn on high-pH blocks.
  • Foliar-application follow-up - schedule a re-check 4 weeks after every Zn spray.
  • Soil pH reminder - annual check on any block that has shown Zn deficiency.