Volcanophos Rock Dust

2kg	$14.25
10kg	$34.99

This is a great addition to the rock dust line up we offer. Volcanophos is a carbonatite/phosphate igneous rock that comes from the Kapuskasing area in Ontario. The unique thing about this mineral is that it is the only igneous rock available in North America that contains apatite, which is a phosphorus source. In addition to this, the igneous base to this deposit means that it contains a profuse range of trace minerals and rare earth elements, which sedimentary rocks generally lack.

Like most of our rock dusts, we have this material micronized. This makes for a more costly product, as the material, which initially comes in a sand like texture, is then ground down into a fine powder. However, this greatly increases surface area of the rock dust, which in turn allows the biology in the soil to more readily access to the material. This results in it being broken down more rapidly.

As with all rock dusts, it is best mixed with a compost or peat carbon source in order to facilitate the breakdown into bio available forms. Therefore this is an excellent material to add to your compost piles at a rate of approx. 10% by volume.

This product is approved for organic use.

Application

VolcanoPhos is typically applied at a rate of 300 to 500 lbs per acre each year until optimal phosphorus levels are reached. In a soil mix, use at a rate of approx 1/2 cup per cubic foot of mix.

A certified agronomist should be consulted with regards to Volcanophos and its application rates specific to your needs.

Equivalency Measurement - 6 cups/2kg

Attachments:

Ecocert 2026