Magnesium sits at the centre of every chlorophyll molecule. When older leaves yellow between the veins, magnesium is usually the answer.
Reading the symptoms
Magnesium deficiency shows first on older leaves as interveinal yellowing while the veins stay green. Heavy-cropping fruit plants and sandy soils are most affected. Magnesium nitrate is fully soluble and also brings quick nitrate nitrogen.
Magnesium Nitrate Dosage
| Application | Rate | Stage |
|---|---|---|
| Foliar spray | 2–3 ml per litre | At first yellowing signs |
| Drip / Fertigation | 2–4 L per acre | Active growth & fruiting |
👉 Pro tip: Don’t confuse magnesium (older-leaf yellowing) with iron deficiency (younger-leaf yellowing) — the treatment differs.
Key Takeaways
- Central atom of chlorophyll
- Greener leaves, better photosynthesis
- Fully soluble + nitrate N
- Targets older-leaf yellowing
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Disclaimer: doses are general guidelines. Always adjust to crop, soil test, growth stage and local agronomist advice.