Calcium Magnesium Nitrate (CalMag) Water Soluble Fertiliser | N 13.9% Ca 12.6% Mg 3.4%
Calcium Magnesium Nitrate (CalMag) Water Soluble Fertiliser | N 13.9% Ca 12.6% Mg 3.4%
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Calcium Magnesium Nitrate (CalMag) Water Soluble Fertiliser
Stop calcium and magnesium deficiencies before they cost you yield. This is a fully water soluble calcium magnesium nitrate powder that gives your plants three things in one scoop: calcium for strong cell walls, magnesium for deep green leaves, and fast-acting nitrogen to drive growth. It dissolves clean, works in any system, and costs a fraction of bottled liquid CalMag.
Guaranteed analysis
| Element | g/kg | % |
|---|---|---|
| Nitrogen (N) | 139 g/kg | 13.9% |
| Calcium (Ca) | 126 g/kg | 12.6% |
| Magnesium (Mg) | 34 g/kg | 3.4% |
Contains no phosphorus (P) or potassium (K). The calcium to magnesium ratio is roughly 3.7:1, right in the range most growers aim for.
Why growers use it
- Coco coir grows: coco naturally holds on to calcium and magnesium, which leaves less for your plants. A CalMag supplement is standard practice in coco.
- RO, rain or soft water: if your water has very little calcium and magnesium in it, your base nutrient alone often will not supply enough.
- LED grow lights: plants under strong LED lighting commonly show a higher demand for calcium and magnesium.
- Fruit and flower quality: calcium helps prevent blossom end rot in tomatoes and peppers and tip burn in lettuce and leafy greens.
- Far better value than liquids: bottled CalMag is mostly water. With a soluble powder you pay for nutrients, not shipping water.
Signs your plants need CalMag
- Calcium deficiency: twisted or stunted new growth, brown or rust coloured spots on leaves, weak stems, tip burn, blossom end rot and flowers dropping early.
- Magnesium deficiency: yellowing between the veins while the veins stay green, starting on the older, lower leaves. Leaf edges may curl upward.
How to use
Dissolve fully in water before adding to your reservoir or watering can. Always measure EC and start at the low end.
| Dose per litre of water | N added | Ca added | Mg added |
|---|---|---|---|
| 0.25 g/L (maintenance) | 35 ppm | 32 ppm | 9 ppm |
| 0.5 g/L (standard supplement) | 70 ppm | 63 ppm | 17 ppm |
| 1 g/L (correcting a deficiency) | 139 ppm | 126 ppm | 34 ppm |
- Hydroponics and coco: add to your reservoir with your base nutrients, then adjust pH.
- Soil and containers: dissolve and water in as a drench.
- Remember the nitrogen: this product adds nitrogen as well as calcium and magnesium, so account for it, especially in late flower.
Important mixing rule
Never mix this product in concentrated form with sulphates or phosphates (for example Epsom salts, potassium sulphate, MKP or a concentrated base nutrient). Calcium reacts with them and drops out of solution as a solid. In a two tank system it belongs in Tank A with your calcium nitrate. Once diluted in your final reservoir it is perfectly fine to combine.
Pack sizes
- 1kg: ideal for home growers and tents. At 0.5 g/L one bag treats 2,000 litres of water.
- 25kg bag: best value for commercial growers, greenhouses and hydroponic farms.
Store sealed in a cool, dry place. This product absorbs moisture from the air, so close the bag properly after each use. Packaging may vary.
Pairs well with: Hydroflow Hydroponic Nutrient, Calcium Nitrate, Potassium Sulphate and Epsom Salts to build a complete, professional feeding programme at a fraction of the cost of bottled nutrients.
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