Improve the efficiency of your farm by optimising the nutrient availability of the soil. Use our range of granulated Calcium based fertiliser products including Calcium lime, Magnesium lime and Calcium Sulphate.
Calcifert Mag
Ideal for soils that have a pH imbalance and are also lacking in magnesium.
- Product uses
- Product information
- SPREADER SETTINGS
- FAQs
Uses for magnesium lime
Our fertiliser Magnesium Lime is ideal for soils that have a pH imbalance and are also lacking in magnesium.
Magnesium is:
- an essential ingredient of chlorophyll, the green plant pigment that gives leaves their colour and enables photosynthesis
- crucial to phosphate and nitrogen metabolism
- a key component for healthy plant growth and protein synthesis
Along with potassium, magnesium helps regulate a plant’s uptake of water, and adequate magnesium levels are vital to establishing good crops. Magnesium lime also balances soil pH giving:
- Improved crop performance
- Better crop quality and yield
- Better fertiliser efficiency

Calcifert Mag product details
Our Calcifert Mag is:
- a granulated dolomitic limestone
- manufactured in the UK
- containing more than 19% magnesium as MgO
- granulated using dolomitic limestone flour and a water-soluble binder
Calcifert Mag benefits
The agricultural industry knows that our LKAB Minerals Calcifert Mag gives the following benefits:
- Can be self-spread using standard farm fertiliser spreading equipment.
- High reactivity means lower application rates than standard magnesium lime, making Calcifert Mag a cost-effective option.
- Granules of a regular shape and size ensure even spread and rapid uptake.
- Suitable for all crops including grassland and forage crops, cereals and oilseeds, fruit, veg, vines and hops.
- Independent tests have shown that Calcifert Mag can be accurately spread at up to 36 metres.
Magnesium deficiency
Magnesium deficiency is most likely to occur on light sandy soils and shallow chalk soils with low organic matter. Soils with low pH are also prone to magnesium deficiency. High levels of potassium in the land, caused by potash-rich soils or overuse of potash fertiliser, reduce the ability of plants to take up magnesium.
Application rate Calcifert Mag
The application rate will depend on the amount of Magnesium required by the soil. To make sure you use the correct application rate for Calcifert Mag we suggest you to seek FACTS qualified advise.
Packaging Calcifert Mag
LKAB Minerals supplies the Calcifert Mag in 600 kg big bags.
You can apply our Calcifert products via a conventional fertiliser spreader. Independent tests have shown that Calcifert granulated products can be accurately spread up to 36-metre bout widths.
Spreader setting results
Trials with a range of leading fertiliser spreaders have shown that Calcifert Lime spreads to 36 metres and has a Co-efficient of Variance of less than 3.7%. We have tested:
- Amazone ZA-M
- Kuhn Axis
- KRM Ex trend
- Vicon RSXL
Calcified Lime+ has the same product characteristics as Calcifert Lime, and we recommend following the same spreader setting for these products.
Calcifert Sulphur has a similar spread pattern and has been separately tested with a range of fertiliser spreaders. For Calcified Sulphur+ products, we recommend using the Calcifert Sulphur spreader settings.
Trials with Calcifert Mag show that this product successfully spread to up to 36-metre bout widths.
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How do I know if I require Mag Lime?
+Ensure a broad spectrum soil analysis is carried out so that the balance between Calcium and Magnesium can be worked out.
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Which soils are more likely to require Magnesium?
+All soils require Magnesium when balancing the soil’s nutrients. However, once a heavier clay soil has the correct level, it is less likely that it will need Mag Lime. Sandy soils do not hold on to nutrients as strongly and require regular amounts of all including Magnesium. These soils are therefore more likely to request this product.
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How much Magnesium is in Calcifert Mag?
+This product has a high Magnesium content and is classified as a dolomite limestone with 19% MgO.