Rock Phosphate, 0-3-0

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Rock Phosphate, 0-3-0 is the base to building soil phosphate levels for long-term plant productivity.  It's a natural source of phosphorous and calcium and is excellent for preventing calcium deficient soils.

DTE Rock Phosphate is a premium grade powder that is an excellent nutrient resource for all types of flowering plants including bulbs, fruits, shrubs, trees and vegetables.

Ingredients:  Soft Rock Phosphate.

Interested in reading more about organic soil amendments? We have additional information located on our Organic Soil Amendments page.

Conversions:   1.5 cups = 1 lb;   1/4 cup = 3 oz;   1 Tbsp = 0.75 oz omri-image.png

Suggested application rates:

Vegetable Gardens and Flower Beds

¤ New: apply 2.5 - 5lbs per 100 sq ft, thoroughly mix into the top 3" of soil.

¤ Transplants: add 1/4 cup per hole, mix into soil and water well.

¤ Established: side dress 1/4 - 1/2 cup in fall or early spring to promote fruiting and flowering during the grow season.


¤ Add 1 Tbsp per hole for average size bulbs, more for larger varieties, thoroughly mixing into soil and water well.


¤ New: add 1/4 cup per gallon of soil, mixing thoroughly (or add 5 - 10 lbs per cubic yard).

¤ Established: lightly mix 1 Tbsp per gallon into the soil surface once each month during the growing season.

Trees and Shrubs

¤ New trees: prepare transplant hole by mixing 1 - 2 cups into the back fill soil; use the amended soil to fill in around the new tree and water well.

¤ Existing: spread 1 lb per 1" of trunk diameter around the base outwards to the drip line, mix into soil surface and water well.



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Additional Info

Additional Info

0-3-0. OMRI Certified. Available Phosphate (P2O5) 3.0%. Calcium (Ca) 18.0%.
Conversions: 1.5 cups = 1 lb; 1/4 cup = 3 oz; 1 Tbsp = 0.75 oz