Bulb crops need sulphur for pungency and storage, plus balanced nitrogen, phosphorus and potassium timed to bulb formation.
Sulphur is the secret
Nitrogen and phosphorus build the leaf frame early; too much late nitrogen delays bulbing and hurts storage. Potassium and sulphur size the bulb and build pungency and keeping quality.
Onion / Garlic Guide
| Stage | Focus | Products |
|---|---|---|
| Establishment | N + P | UAN 32, 10-34-00 |
| Bulb initiation | K + S | K-URJA |
| Bulb development | K + Ca + S | 00-24-24, Calcium Boost |
👉 Pro tip: Stop nitrogen early once bulbing starts — late nitrogen gives thick necks and poor storage.
Key Takeaways
- Sulphur builds pungency & storage
- Potassium sizes the bulb
- Cut nitrogen at bulb initiation
- Calcium improves keeping quality
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Disclaimer: doses are general guidelines. Always adjust to crop, soil test, growth stage and local agronomist advice.