Nickel deficiency symptoms: mouse-ear and leaf tip burn
What nickel deficiency looks like, why it is rare in Indian fields, and how to tell it from urea burn and other leaf tip problems.
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Nickel (Ni) in crops: role, deficiency signs and how to correct it
What nickel does in crops, how a shortage looks in each crop, why it happens, what it costs if ignored, and how growers confirm and correct it.
Nickel is the micronutrient the plant needs in the smallest amount. It is part of urease, the enzyme that breaks down urea inside the plant. Without nickel, urea builds up in the leaves and burns their tips, and seeds may germinate poorly. Field deficiency is rare in India, but nickel matters more as crops are fed mainly with urea and foliar urea sprays.
By Gafar Laiya and the Gujarat Bio Organics team. Updated November 2026.
On this page
What nickel does in the plant
- Part of urease, the enzyme that breaks urea into ammonia the plant can use.
- Helps the plant use nitrogen, especially in legumes and when urea is sprayed on leaves.
- Needed for healthy, viable seed in some crops.
- Supports some plant defences.
How nickel moves in the plant
Nickel moves fairly well in the plant and is carried to seeds and new growth.
Signs of nickel deficiency
- Dead, burnt leaf tips from urea build-up, especially after urea sprays.
- Small, rounded, blunt leaves at shoot tips (mouse-ear, seen in pecan and some tree crops).
- Poor seed germination.
- Pale young leaves.
Crop by crop
| Crop | What a shortage looks like |
|---|---|
| Legumes | Leaf tip necrosis from urea build-up and weaker nitrogen use. |
| Cereals | Poor seed viability in severe cases. |
| Tree crops | Mouse-ear: small, rounded, blunt leaves at shoot tips, best known in pecan. |
| Crops sprayed with urea | Leaf tip burn where urea is not broken down. |
More crops and look-alikes: Nickel deficiency symptoms: mouse-ear and leaf tip burn.
Where and why it happens
- Very rare in fields; most soils supply enough.
- Sandy, leached soils with heavy zinc, copper or calcium.
- Soilless and hydroponic growing where nickel is left out.
How it works with other nutrients
- Excess zinc, copper, iron, calcium or magnesium can lower nickel uptake.
- Heavy urea feeding raises the crop's reliance on urease, so on nickel.
- See nutrient interactions.
What happens if it is not managed
- Urea builds up and burns leaf tips.
- Weaker nitrogen use, so more fertilizer for the same growth.
- Poorer seed quality.
- See the full picture of what unmanaged shortages cost.
How to confirm it
- Suspect it only after other causes are ruled out, because it is rare.
- Leaf tip burn after urea sprays is one clue.
- A leaf test confirms; ask a lab that tests trace elements.
How to correct it
- Usually no correction is needed in field crops.
- Where a test confirms shortage, a very light foliar nickel product is used.
- Do not add nickel without a test: excess is toxic.
Too much nickel
- Nickel toxicity is more common than deficiency, on serpentine soils and soils that received industrial sludge.
- Signs are yellow young leaves similar to iron shortage and stunted roots.
Doses depend on the crop, soil and product, so this page gives methods, not amounts. Take the dose from your soil test report, the product label or your local agriculture officer or KVK. Results differ from farm to farm with soil, weather, crop and management. Farmer experiences on this site are their own reports, not a promise of results.
More on nickel
Nickel and urea: why plants need nickel to use urea
How the nickel enzyme urease lets plants use urea, what happens without it, and why it matters for crops fed mainly with urea.
Read the full guideRead the leaves: symptom guide
Which nutrient each pattern points to.
Read the full guideHow Gujarat Bio Organics can help
Since 2006, lakhs of farmers from Kashmir to Kanyakumari have used Immunity products on almost every crop: from the mango farms around Somnath to the apple orchards of Himachal Pradesh and Kashmir, the tea estates of Assam and Darjeeling, and the banana, coconut and cardamom farms of Tamil Nadu, Karnataka and Kerala. Each Special is one formula made for one crop and its common problems. Tell us your crop, soil test and what you see, and our team will tell you what to check, whether a micronutrient correction is needed, and which Special fits your programme.
Results differ from farm to farm with soil, weather, crop and management. Farmer experiences on this site are their own reports, not a promise of results.
Questions
Why do plants need nickel?
Nickel is part of urease, the enzyme that breaks down urea inside the plant. Without it, urea burns the leaves.
Should I add nickel to my crop?
Rarely. Field deficiency is uncommon in India. Add it only if a test shows it is short, because excess is harmful.
Is nickel the most recently recognised plant nutrient?
Yes, it was accepted as essential only in the late twentieth century.