Cobalt guide
Cobalt is a beneficial element. The plant itself is not shown to need it, but the Rhizobium bacteria in legume nodules do: they need cobalt...
Read the full guideCobalt deficiency signs in legumes and livestock fodder
How cobalt shortage shows in pulses and fodder legumes, how it affects animals that eat the fodder, and how to tell it from other nodulation problems.
Cobalt shortage shows in legumes as nitrogen-starved plants with poor nodules, because the nodule bacteria cannot make vitamin B12. It also matters for livestock, which need cobalt from their fodder. Because molybdenum, sulphur and poor inoculation cause similar signs, check those first.
By Gafar Laiya and the Gujarat Bio Organics team. Updated November 2026.
Crop by crop
| Crop | What you see |
|---|---|
| Pulses: gram, tur, moong, urad | Pale plants with poor nodules on cobalt-poor soils. |
| Groundnut and soybean | Pale leaves and weak nodulation. |
| Fodder legumes such as berseem and lucerne | Weak nodulation and low cobalt in fodder for animals. |
Check these before cobalt
- Was the seed inoculated with the right Rhizobium culture?
- Is the soil acid, suggesting molybdenum shortage?
- Are young leaves pale, suggesting sulphur shortage?
- Is the field waterlogged?
Signs in animals
- Poor appetite and weight loss on cobalt-poor pasture.
- Ask a veterinarian; mineral supplements for animals are the usual fix.
Confirm and correct
- Confirm with a soil or leaf test before you spend.
- Read the full cobalt guide for causes and correction.
- Use the symptom guide to compare with other nutrients.
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
Cobalt and Rhizobium: the trace element behind nitrogen fixation
How cobalt lets Rhizobium bacteria fix nitrogen in pulse roots, why only a trace is needed, and why too much does harm.
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.
- Pulses guide and Immunity Pulses Special
- Groundnut (Mungfali) guide and Immunity Mungfali (Groundnut) 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
What does cobalt deficiency look like in pulses?
Pale plants with poor nodules on cobalt-poor soils.
What does cobalt deficiency look like in groundnut and soybean?
Pale leaves and weak nodulation.
What does cobalt deficiency look like in fodder legumes such as berseem and lucerne?
Weak nodulation and low cobalt in fodder for animals.