6675 Highway 15
Seeleys Bay, ON K0H 2N0

Application Rates

General application rate recommendations are 1-2 tonnes/acre when beginning to use Canadian Wollastonite. We encourage growers to experiment with higher and lower application rates to optimize results.

The following rates are suggested as guidelines for Canadian Wollastonite:

Application Rate
Greenhouses 6 to 10lbs/cubic yard (1/4c./ga)
Gardens 1 cup/yard of row at seeding 2tsp. to 1/3 cup at transplanting 2tsp./plant topdressed
Vegetable Fields 1.6 to 4.4 t/ac broadcast 150 to 600 lbs/ac banded at seeding or transplant (according to crop family)
Field Crops 0.5 to 2.2 t/ac broadcast 300 to 500 lbs/ac banded
Turfgrass 1 to 1.75 t/ac
Lawns & Trees 50 to 80 lbs/1000 sq.ft. (33 ft x 33 ft)


The Power of Small Powdered Canadian Wollastonite

Wollastonite is available as a fine powder with 90% passing 200 mesh greatly enhancing the release of the product providing close to immediate results with much lower application rates.

Application rate varies depending on the application and caution is required when applying this product due to its high reactivity. Please contact us for more information.



Considerations & Guidelines

Wollastonite should be used as part of a complete fertilizer program to provide silicon, calcium, magnesium, sulphur, iron, and micronutrients.

Application timing – Annual application in spring or fall is ideal. However, growers report significant benefits for 2-4 years after application.

Maximum application – The recommended application rate should not exceed an equivalent annual application of 8900 kg/ha.

Adjusting soil pH – The calcium in Wollastonite has 90% of the availability of lime. If calcium applications are to adjust pH use 20% more  wollastonite than a typical lime (80% CCE). Consider magnesium and potassium levels as well when adjusting soil pH.

Compost – When adding Wollastonite to compost we suggest mixing it with mature compost towards the end of the process to avoid altering the pH of the pile during the thermophilic ‘hot’ phase.