Liquid Calcium & Magnesium Fertilizers: Stronger Cells, Better Fruit, More Tubers

Calcium is the nutrient growers most often overlook — until fruit cracks, tomatoes develop blossom-end rot or lettuce shows tip burn. Because calcium moves slowly inside the plant, it needs to be supplied regularly and in a readily available form. Liquid calcium fertilizers do exactly that, and when combined with magnesium and boron they protect both yield and quality.

Why calcium matters

Calcium is a structural nutrient: it binds plant cell walls together, giving fruit and tubers their firmness and resistance to splitting, bruising and disease. Calcium travels with the water stream inside the plant, so fast-growing tissues such as fruit tips, new leaves and developing tubers are the first to suffer when supply falls short — especially in hot, dry or saline conditions common in the Gulf and many African regions.

Typical signs of calcium deficiency include blossom-end rot in tomatoes and peppers, tip burn in lettuce and cabbage, bitter pit in apples, cracking in fruit and tubers, and soft produce with a short shelf life.

Calcium Magnesium Suspension (calcium magnesium nitrate liquid)

Our calcium magnesium suspension is a concentrated liquid with a typical specification of more than 15% CaO, more than 2% MgO, more than 8.5% nitrate nitrogen and more than 10% total nitrogen, with chloride below 0.2%. In a single application it:

• strengthens plant and fruit cells and reduces cracking;
• encourages more tubers and bulbs to form and supports their sizing;
• keeps leaves green through its magnesium content;
• helps crops recover from stress caused by fungal and viral pressure.

It is particularly suited to banana, watermelon, potato, onion, garlic, ginger, turmeric, beetroot, carrot and other calcium-demanding crops. As a general guide, drip application is around 5 kg per acre (about 5 kg per 1,000 banana plants), and foliar spray is 50–100 g per 15 litres, timed around 15 days before tuber formation. Always confirm rates with your local agronomist.

Calcium Magnesium Boron

Boron works hand in hand with calcium: it helps calcium move into flowers and developing fruit, and is essential for pollen tube growth and fruit set. A combined calcium-magnesium-boron liquid is a convenient way to support flowering crops such as mango, citrus, pomegranate, grapes, tomatoes and cucurbits from bloom through early fruit set.

Calcium Nitrate + Boron 0.5%

Calcium nitrate is the classic soluble calcium source, supplying calcium together with quick-acting nitrate nitrogen. With 0.5% boron added, this liquid is a go-to product for preventing blossom-end rot and tip burn and for improving firmness in tomatoes, capsicum, strawberries, leafy greens and fruit crops.

Tips for using liquid calcium

• Apply regularly — small, frequent doses work better than occasional heavy ones because calcium is not easily moved within the plant.
• Separate tanks — never mix calcium with phosphates (such as MAP or phosphoric acid) or sulphates (such as SOP) in the same concentrated stock tank, as insoluble deposits will form.
• Manage irrigation — steady soil moisture helps calcium uptake; irregular watering is a major cause of blossom-end rot.
• Combine with silicon in hot climates — orthosilicic acid further strengthens cell walls against heat and drought stress.

Packaging and supply

Mitra Eco Exports supplies liquid calcium products in sealed HDPE cans and drums (for example 30 kg cans and 220–240 kg drums), with private-label options and a batch Certificate of Analysis. Pair them with our boron and micronutrient liquids for a complete secondary-nutrient programme.

This guide is for general information. Application rates and product choice depend on crop, soil, water quality and local regulations; please consult a qualified agronomist and check registration requirements in your country.