Rock Phosphate (BioPhos)


Rock Phosphate (BioPhos) is a premium fertiliser supplying high quality phosphorus, magnesium and calcium and is internationally recognised as a silica fertiliser. This makes Rock Phosphate New Zealand’s only fertiliser containing scientifically proven amounts of soluble silica. Silica has been scientifically proven to strengthen the plant and increase a plants ability to fight insects, diseases and droughts, and increase a plants ability to absorb phosphorus.

Product form:

Dry powder

NPK analysis:


High on Calcium (20%), Magnesium (8%) and Silica (10%).

Primary function/use:

Slow-release phosphate fertiliser.

Other product highlights:

A great alternative to bat guano.

Product designation:

Natural product

Best suited for:

Well suited for amending and enhancing the soil.

When and where to use:

Start with early season soil preparation and supplement as needed during grow cycle.

How to apply:

Sprinkle evenly around base of plant or till into soil before planting.

How to mix:

Vegetable Gardens: 50 grams per m2. Side dressed or spread. Can be worked into soil, even close to seeds.

Pasture: 150 – 300 kg per hectare depending on soil pH (use the lower spread rate for high pH and higher spread rate for low pH).

Trees & Shrubs: 100g per 3-5cm diameter of tree.

Perennials & Roses: 30 grams per each new plant


Ensure bag is properly sealed and stored in cool, dry, dark place.

Additional information

Weight N/A

0.75kg, 12.5kg, 2.5kg, 20kg, 7.5kg