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The fastest and cheapest way to identify a micronutrient deficiency is visual diagnosis. Each deficiency has a characteristic pattern — once you know the clues, you can usually identify the problem in the field in under 5 minutes.
This guide covers the 7 most common micronutrient deficiencies in Indian agriculture, with the specific pattern to look for in each case.
🔍 Golden rule of deficiency diagnosis:
Old leaves first = mobile nutrients (Nitrogen, Phosphorus, Potassium, Magnesium)
Young leaves first = immobile nutrients (Iron, Zinc, Calcium, Boron, Copper, Manganese)
This one rule eliminates half the confusion immediately.
1. Zinc Deficiency
- First visible on: Young/new leaves
- Pattern: Interveinal chlorosis — veins stay green, blade turns pale yellow to white
- Other signs: Small leaves, shortened internodes, stunted plant, "little leaf" in fruit trees
- Confused with: Iron deficiency (but zinc deficiency — veins less sharply defined)
- Most common in: Rice (Khaira disease), maize, grapes, onion, citrus
- Correction: Zinc EDTA 12% at 0.5 g/L foliar, or Zinc Sulphate 33% 10 kg/acre basal
2. Iron Deficiency
- First visible on: Youngest leaves at shoot tips
- Pattern: Sharp interveinal chlorosis — distinct green veins on yellow/white blade
- Other signs: Severe cases — entire shoot turns cream-white
- Confused with: Zinc deficiency (iron pattern is sharper, on youngest leaves)
- Most common in: Pomegranate, grapes, banana on black cotton soil Maharashtra
- Correction: Iron EDDHA 6% for soil pH above 7.5; Iron DTPA 11% foliar/drip
3. Boron Deficiency
- First visible on: Growing tip and youngest leaves
- Pattern: Tip dieback, thick-walled distorted leaves, hollow stem
- Most distinctive: Flower drop and poor fruit set — often the first symptom noticed
- Most common in: Cotton, grapes, tomato, cauliflower, sunflower
- Correction: Boron 20% WSP at 1–1.5 g/L foliar at bud stage
4. Calcium Deficiency
- First visible on: Youngest rapidly growing tissue (shoot tips, fruit)
- Pattern: Tip burn, blossom end rot in fruit, poor cell wall formation
- Fruit symptoms: Tomato/capsicum — dark sunken patch at fruit base (blossom end rot); Grapes/pomegranate — fruit cracking
- Most common in: Tomato, capsicum, grapes, pomegranate, apple
- Correction: Calcium Nitrate 2 kg/acre drip weekly; Calcium EDTA 2 g/L foliar
5. Magnesium Deficiency
- First visible on: OLDER leaves (magnesium is mobile — plant moves it to young tissue)
- Pattern: Interveinal chlorosis on mature leaves — green veins, yellow-purple interveinal areas
- Most common in: Grapes (Nashik), pomegranate, banana, potato
- Correction: Magnesium Sulphate 9.9% at 5 g/L foliar × 3 sprays, or 1 kg/acre drip
6. Manganese Deficiency
- First visible on: Young leaves
- Pattern: Interveinal chlorosis similar to iron but less severe — grayish-green mottling
- Most common in: Soybean, wheat, rice, oats — especially overlimed or waterlogged soils
- Correction: Manganese EDTA 13% at 1–2 g/L foliar; Manganese Sulphate 30.5% 5 g/L
7. Copper Deficiency
- First visible on: Young leaves and shoot tips
- Pattern: Wilting/drooping of young shoots, tip dieback, blue-green discolouration
- Cereals: "Reclamation disease" — twisted leaves, empty grain, white ear tips
- Most common in: Wheat on high-organic matter or newly reclaimed soils; citrus; coffee
- Correction: Copper EDTA 15% at 0.3 g/L foliar; Copper Sulphate 25% 2–5 g/L
Quick Reference Chart
| Deficiency | Which Leaves | Pattern | Quick Test |
|---|
| Nitrogen | Old leaves first | Uniform pale yellow, whole leaf | Entire plant pale green |
| Iron | Young leaves | Interveinal chlorosis, sharp veins | Green veins on white leaf |
| Zinc | Young leaves | Interveinal chlorosis, less sharp | Small leaves + stunting |
| Magnesium | Old leaves | Interveinal chlorosis, purple tinge | Old leaves yellowing |
| Manganese | Young leaves | Grayish mottling | Similar to Fe but less severe |
| Boron | Growing tip | Tip death, distorted growth | Flower drop, hollow stem |
| Calcium | Growing tip + fruit | Tip burn, BER | Blossom end rot in tomato |
| Copper | Young shoots | Wilting, tip dieback | Drooping young leaves |
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