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Blog › Iron Chlorosis in Pomegranate — Complete Treatment...
Walk into any pomegranate orchard in Solapur or Nashik in March and you will find it — young leaves that should be dark green are instead pale yellow, almost white, while the veins remain green. This is iron chlorosis, and it is destroying yields and quality in Maharashtra's pomegranate belt.
Worse, most farmers are applying the wrong iron product — and wasting thousands of rupees with zero result.
How to Identify Iron Chlorosis
Iron deficiency shows a very specific pattern called interveinal chlorosis:
- Youngest, actively growing leaves go yellow first — not old leaves (unlike nitrogen deficiency)
- The leaf blade turns pale yellow or white
- The veins stay green — creating a distinctive "green veins on yellow background" pattern
- Severe cases: entire shoot system turns cream-white with almost no green visible
- Fruit set is poor, fruits are small and pale
🔍 Confirm with soil test: Get DTPA extractable iron and soil pH tested. If soil pH is above 7.8 and DTPA-Fe is below 4.5 ppm, you have confirmed iron chlorosis. Most Nashik/Solapur black cotton soils run pH 7.8–8.5 — almost all are at risk.
Why Black Cotton Soil Causes Iron Deficiency
Iron is the 4th most abundant element on earth — there is no shortage of iron in the soil. The problem is availability.
At pH above 7.5, iron converts to insoluble iron hydroxides (Fe(OH)₃) that plant roots cannot absorb. The iron is physically present — but locked up. This is called lime-induced chlorosis and it is entirely a pH problem, not a soil iron shortage.
| Soil pH | Iron Availability | Risk Level |
|---|
| Below 6.5 | High (may cause toxicity) | Low risk of deficiency |
| 6.5 – 7.0 | Adequate | Low |
| 7.0 – 7.5 | Reducing | Medium |
| 7.5 – 8.0 | Low | High |
| Above 8.0 | Very low | Very High — deficiency almost certain |
EDDHA vs DTPA vs EDTA — Which Iron Product Actually Works?
This is where most farmers go wrong. All three are "chelated iron" but they behave completely differently in alkaline soils.
| Product | Effective pH Range | Use Method | Cost | Verdict for Pomegranate |
|---|
| Iron EDDHA 6% | Up to pH 11 | Soil only | High | ✅ Only real choice for pH >7.5 |
| Iron DTPA 11% | Up to pH 7.5 | Drip + Foliar | Medium | ⚠️ Works only if pH <7.5 |
| Iron EDTA 12% | Up to pH 7.0 | Drip + Foliar | Low | ❌ Useless in black cotton soil |
| Ferrous Sulphate | Acidic soils only | Soil | Very Low | ❌ Converts to insoluble form instantly in alkaline soil |
⚠️ Common mistake: Applying Ferrous Sulphate or Iron EDTA on black cotton soil pH 8+ and getting no result. These products are immediately converted to unavailable forms. Only Iron EDDHA remains stable and plant-available across the full alkaline pH range.
Correct Dose and Timing for Pomegranate
Soil Application (Iron EDDHA 6%)
- Timing: Apply before Mrig bahar pruning (May–June) or before Hasta bahar (August–September)
- Rate: 1.5–2 kg/acre for moderate chlorosis | 2.5–3 kg/acre for severe chlorosis
- Method: Mix with 3–4 kg compost, apply in ring method around drip zone. Water immediately after.
- Repeat: Every bahar — do not skip. Iron EDDHA remains active 6–8 months but one missed application and chlorosis returns.
Foliar Spray (Iron DTPA 11% — supplementary only)
- Rate: 2.5–3 g/L water
- Timing: At bud break, when leaves are young and actively absorbing
- Frequency: Every 10–12 days × 3 sprays
- Note: Foliar is supplementary — it corrects visible chlorosis fast but does not solve the root cause. Soil EDDHA is essential.
5 Common Mistakes Farmers Make
- Using Ferrous Sulphate on alkaline soil — immediately converts to Fe(OH)₃, zero absorption
- Foliar spray only, no soil application — temporary fix, chlorosis returns next season
- Applying after severe chlorosis is visible — apply preventively before bahar, not after symptoms worsen
- Not watering after soil application — EDDHA needs to move into root zone with irrigation
- Buying low-purity product — iron EDDHA quality varies enormously. Check that o,o-EDDHA is above 3.5% (full chelation)
Annual Prevention Program
| Timing | Product | Rate | Method |
|---|
| Pre-Mrig bahar (May) | Iron EDDHA 6% | 2 kg/acre | Soil ring method |
| Bud break (Jun–Jul) | Iron DTPA 11% | 2.5 g/L × 3 sprays | Foliar |
| Pre-Hasta bahar (Aug) | Iron EDDHA 6% | 1.5 kg/acre | Soil |
| Fruit sizing | Iron DTPA 11% | 2 g/L | Drip |
📖 Also apply: Zinc EDTA 12% (0.5 g/L foliar) along with iron sprays — zinc and iron deficiencies often occur together in alkaline soils.
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