Micronutrient deficiency symptoms: how to read the leaves
A field guide to reading nutrient deficiency symptoms: old leaves or new, pattern and colour, which nutrient each points to, and the look-alikes to rule out.
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When several nutrients are short: interactions and why one fix fails
How nutrients block or help each other, why a field can show one deficiency when the real limit is another, and why treating the visible symptom often fails.
Nutrients do not act alone. Some compete for uptake, some need each other to work, and soil pH changes which ones are available. That is why a field can show one deficiency while the real limit is another: a calcium-type fruit problem may really be magnesium balance, boron or irregular watering, and spraying calcium does not fix it. Testing several nutrients together shows the real cause.
By Gafar Laiya and the Gujarat Bio Organics team. Updated November 2026.
On this page
Nutrients that compete
| When this is high | This can run short | Common situation |
|---|---|---|
| Phosphorus | Zinc, iron | Years of heavy DAP |
| Potassium | Magnesium, calcium | Heavy potash on fruit and vegetables |
| Calcium and lime (high pH) | Iron, zinc, manganese, boron, magnesium | Calcareous soils of Gujarat and the Deccan |
| Ammonium nitrogen | Calcium, magnesium, potassium | Heavy urea and ammonium fertilizers |
| Iron | Manganese, zinc | Heavy iron sprays |
| Zinc | Iron, copper | Repeated heavy zinc |
| Copper | Iron, zinc | Orchards sprayed often with copper |
| Sulphate | Molybdenum | Heavy sulphate on acid soils |
| Sodium and chloride | Potassium, calcium, nitrate | Saline water and soils |
Nutrients that need each other
- Nitrogen needs sulphur to become protein; without sulphur, nitrogen is wasted.
- Calcium needs boron to build cell walls; boron shortage can look like calcium shortage.
- Magnesium helps the plant take up and move phosphorus.
- Molybdenum and cobalt are needed for legumes to fix nitrogen.
- Zinc is needed for the plant to make the growth hormone that uses the other nutrients well.
Why the visible symptom misleads
A plant shows the symptom of whatever is most limiting at that moment, in the part of the plant that suffers first. Calcium-type fruit disorders can appear on calcium-rich soil because water supply, excess potash or ammonium, magnesium imbalance or boron shortage stop calcium from reaching or working in the fruit. Spraying calcium again and again then does not solve the problem. The same happens with iron chlorosis on lime-rich soil, where adding iron to the soil does not help because the cause is high pH and poor drainage.
In Indian soils several shortages often come together. The ICAR soil survey found sulphur with zinc, zinc with boron, and sulphur with boron among the most common pairs, and fields with three or more shortages too.
A better way to diagnose
- Test the soil for pH, organic carbon, NPK, sulphur and micronutrients together, and for calcium, magnesium and potassium balance where fruit disorders appear.
- Add a leaf test for orchards and high-value crops.
- Look at the history: fertilizer doses, sprays, irrigation and weather.
- Correct the cause, such as pH, drainage, water supply or imbalance, before adding more of the visible nutrient.
- Read how to diagnose and correct micronutrient problems.
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.
Read next
What happens when micronutrients are not managed
How unmanaged micronutrient shortage cuts germination, flowering, fruit set, size, brix and price, and raises fertilizer and spray costs.
Read the full guideHow to diagnose and correct micronutrient deficiency
Step by step: observe, rule out other causes, test, fix the cause, choose the method, time it right, and build soil so the shortage does not return.
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.
- Mango guide and Immunity Mango Special
- Sugarcane guide and Immunity Sugarcane Special
- Potato guide and Immunity Potato Special
- Cotton guide and Immunity Cotton Special
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 did calcium spray not cure the fruit problem?
Often because the cause was not calcium in the soil but magnesium imbalance, boron shortage, excess potash or irregular watering. Fix the cause and the calcium already present can do its job.
Can too much of one fertilizer cause another deficiency?
Yes. Heavy phosphorus can cause zinc shortage, heavy potash can cause magnesium shortage, and heavy lime can cause iron and zinc shortage.
Which test shows nutrient balance?
A soil test covering pH, sulphur, micronutrients and exchangeable calcium, magnesium and potassium, with a leaf test for orchards.