Incorporates dolomite in BioAgPhos. Ideal for soils that need phosphorus, sulphur, calcium, and magnesium, such as pastures and grazing systems where there is a risk of grass tetany.
Phosphorus 6.0% | Sulphur 5.0% | Calcium 28.0%

Phosphorus 0% water soluble and a minimum of 35% Citric Acid and 65% Formic Acid solubility. Immediate and sustained release phosphate fertiliser made from high-grade reactive phosphate rock composted with BioAg’s proprietary phosphate digester. Combined with dolomite to provide magnesium.

Delivers immediate and sustained release of phosphorus making both annual and biennial applications appropriate.

  • A natural and sustainable alternative to conventional fertilisers
  • Reduces nutrient losses due to common issues such as leaching and lock up
  • Can be applied at any time of the year.
  • Safe for use on all areas including waterways
  • Small particles enable even distribution; beneficial given P is not mobile in soils
  • BioAg MagPhos is a certified organic input.

Magnesium is important for animal health, and prevention of grass tetany. Read more about Magnesium Deficiency.

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Contact your Area Manager today for a tailored plan for your crop.

MagPhos resources

  • Reactive phosphate rock fertiliser

    The phosphate rock used in agriculture is known by a number of names. Reactive phosphate rock (RPR), direct application phosphate rock (DAPR), mineral phosphate, soft rock, hard rock. Variants on all of these are names or brands used across the fertiliser industry. Phos...

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  • Measuring P in soils when using natural phosphate fertilisers

    The Olsen and Colwell soil tests are strongly correlated when using water soluble/chemical fertilisers. However, these tests will likely underestimate plant available phosphorus (P) when fertilising with natural fertilisers such as RPR or BioAgPhos. P is an important el...

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  • Magnesium deficiencies

    Five things to consider in identifying magnesium deficiency in pastures: Are there occurrences of grass tetany in my stock? Is it necessary to supplement feed magnesium regularly? Do soil or tissue tests indicate a magnesium deficiency? Do the pastures display nitrogen ...

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  • 'Super' or reactive phosphate rock?

    What is superphoshate? Superphosphate, ‘SSP’ or ‘super’ is a fertiliser processed using sulphuric acid to boost the water solubility of phosphorus. Various strengths of P plus additions of nitrogen make up a range of products that feature a high proportion of nutrients ...

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