Applications & spread rates

How to put Calphos to work.

Calphos is built for sustainable agriculture, turf, ornamentals, and natural growing. Use it to correct a phosphorus deficiency, or feed soil life for the long term. The rates below are a starting point. For best results, follow a complete fertility program guided by a regular soil test.

Turf per 1,000 sq ft
Use	Rate
Maintenance	6 to 12 lbs
Soil correction	12 to 24 lbs

Agricultural broadcast
Use	Rate
Maintenance	250 lbs per acre
Soil correction	500 lbs per acre
Blend with fertilizer	50 to 200 lbs per acre, or 10% of the total mix

Ornamentals per 1,000 sq ft
Use	Rate
Maintenance	8 to 12 lbs
Soil correction	18 to 24 lbs

Rates are general guidance for the granular grade. Powder rates are comparable. Confirm with your agronomist and a current soil test before large applications.

Why it handles well

Easy to spread, easy to blend.

Granulated for ease of handling, blending, and spreading.
Low moisture, so it flows cleanly and resists clumping.
Runs through conventional fertilizer equipment.
Delivers a combination of available and slow-release phosphorus.
Available in two grades: granular and powder.

Soil amendment being measured with a scoop

Blend or broadcast

Test your soil

Start with a current soil test. It tells you whether you are maintaining or correcting, which sets your rate.

Broadcast or blend

Apply Calphos on its own, or blend it into a complete program at roughly 10 percent of the total mix.

Feed the soil

For best results, pair with practices that feed soil life, such as compost, so biology can unlock the reserve over time.

Not sure on the rate?

Tell us your crop and acreage and we will help you dial in grade, rate, and freight.

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