Tomato is a hungry crop with a weak spot: calcium. A balanced schedule with steady calcium keeps fruit firm and free of blossom-end rot.
Balance growth and fruiting
Early on, tomatoes need nitrogen and phosphorus for frame and roots. From first flowering, potassium and calcium dominate for fruit size, firmness and shelf life. Keep magnesium topped up to prevent leaf yellowing.
Tomato Feeding Guide
| Stage | Focus nutrients | Products |
|---|---|---|
| Transplant–vegetative | N + P | 10-34-00, UAN 32 |
| Flowering | Ca + Mg + B | Calcium Nitrate, Mg Nitrate |
| Fruiting | K + Ca | K-URJA, Calcium Boost |
👉 Pro tip: Steady moisture + steady calcium is the real secret to zero blossom-end rot.
Key Takeaways
- Calcium is the make-or-break nutrient
- Potassium sizes and firms fruit
- Keep magnesium up for green leaves
- Split feeds across the week
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Disclaimer: doses are general guidelines. Always adjust to crop, soil test, growth stage and local agronomist advice.