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# Diagnose and Respond to Calcium Deficiency in Pineapple

> Identify calcium deficiency in pineapple from edge burn on older leaves, cracked and misshapen fruit, and reduced shelf life, and correct it with lime, gypsum, and foliar calcium at fruit set.

Calcium is critical for cell wall integrity, fruit firmness, and shelf life. On pineapple, deficiency shows as **edge burn on older leaves** and, most importantly, as **cracked, misshapen, short-shelf-life fruit**. Ca uptake is passive and depends on transpiration, so drought and waterlogging both worsen deficiency even when soil Ca is adequate.

**Regional priority:** Moderate on acid mineral soils (leached Ca), peat, and any block with high K without matching Ca.

## When pineapple is most vulnerable

Most damaging at **fruit set to fruit development (months 14 to 18)**. Ca does not redistribute in the plant, so what is in the fruit at set is what stays there.

## How calcium deficiency shows in satellite data

* Not directly detectable. Ca deficiency mainly hits fruit quality, not canopy greenness.
* **Indirect indicator**: acid, sandy, or leached soils flagged as low-Ca zones from block soil maps.
* Confirm by soil test, D-leaf analysis, and fruit sampling.

## Field symptoms

* **Red-brown edge burn** on older leaves, starting at the tip
* **Cracked, misshapen fruit** with cavities inside
* **Short shelf life** and translucent flesh after ripening
* **Reduced fruit weight** in severe cases
* **Overlap with salinity** - separate by soil EC test
* **Overlap with K excess** - excess K reduces Ca uptake

## Reduce the damage by

* **Lime (CaCO3) or dolomite** to raise soil Ca and pH - typically 1 to 3 t/ha per cycle on acid soils.
* **Gypsum (CaSO4)** on sodic or high-K blocks where pH is already fine - supplies Ca without raising pH.
* **Foliar calcium nitrate or calcium chloride (0.5 to 1%)** at fruit set and 2 to 3 weeks after - the critical windows for fruit-quality Ca.
* **Maintain steady irrigation** through fruit development - passive Ca uptake needs stable transpiration.
* **Balance K, Mg, and Ca** - excess K depresses Ca uptake even when soil Ca is adequate.
* **D-leaf analysis** - target 0.15 to 0.30% Ca 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](/snippets/tissue-diagnosis).

## Set an alert for early warning

<Tip>
  Turn the diagnosis into a trigger. Ca deficiency is a fruit-quality signal, so schedule foliar reminders around fruit set and cull-rate tracking at harvest.
</Tip>

Recommended settings for calcium on pineapple:

* **Foliar Ca reminder** - schedule 2 to 3 sprays starting at fruit set on high-K and acid blocks.
* **Soil Ca sampling reminder** - every 2 cycles on acid mineral and BRIS soils.
* **Fruit-quality tracking** - flag blocks with cull rate above 8% for internal defects.

## Related

* [Pineapple Diagnosis](/guides/Crop/Pineapple/pineapple-diagnosis)
* [Potassium](/guides/Crop/Pineapple/nutrient/potassium) - excess K induces Ca deficiency.
* [Boron](/guides/Crop/Pineapple/nutrient/boron) - overlapping fruit-cracking symptoms.
* [Set up automated crop alerts](/guides/alerts-notifications)