Tennessee Brown Phosphate

(1 review) Write a Review
1.00 LBS
Calculated at Checkout

Tennessee Brown Phosphate is one of the cleanest slow-release sources of phosphorus available.  Tennessee Brown Phosphate is derived from high grade phosphorus ore.  It is not a colloidal or a hard rock form of phosphate, but rather a unique source of natural phosphate.  Lab tests show an average content of 23% phosphorus in the form of P2O5, 21% calcium, with the added benefit of 22% Silicon in addition to broad spectrum of trace minerals.   Tests show that when compared to other phosphate sources Tennessee Brown Phosphate contains the least amount of heavy metal contaminants.

Benefits: Increases photosynthesis; increases forage quality; increases Brix giving insect and disease resistance & added test weight; excellent for microbial stimulation including mycorrhizial formation on roots. Excellent calcium source – 20% - and for composting operations to increase available trace minerals – see sidebar: shown in ppm or %.  Tennessee Brown Phosphate is NOP certified and OMRI-listed and allowed for use on organic farms.

Application Methods: 
  • Amending soil:  Apply up to 5 lbs. / 100 sq.ft.
    • If planting in rows, mix with the seed or starter plant and apply up to 1 lb. per 50 ft of row.
    • 300 to 500+ lbs / acre on phosphate deficient soils, and less on fertile soils. 
  • Compost Tea: Use as a food source for fungi.  To increase the growth of fungi in your compost tea, pretreat your compost with 1/4 tsp of finely ground rock phosphate and 1 tsp organic oat or wheat flour for each cup of worm castings, forest humus, mushroom compost, or mature compost.
    • Add 1 teaspoon per 5 gallons of compost tea
  • General Use: Mix 2.5 tbsp. per gallon of water for lawns, gardens, trees and shrubs (will cover 40 sq. ft.).
  • Trees and perennials: Apply 1 - 10 lb. per planting hole, depending on plant size.
  • Transplants: 1 - 2 tablespoons per 4-6" planting hole.
  • Potted plants: Mix 1 teaspoon per 2" pot diameter with potting soil before planting.

Larger rates are possible thereby creating semi-permanent phosphate reserves that will not leach or tie-up calcium.

Nitrogen (N)...................... 0%

Phosphorus (P2O5)........ 22.7%

Potassium (K)................... 0.37%

Calcium (Ca).................. 21.2%

Iron (Fe)........................... 3.5%

Silicon Dioxide (Si)........ 22.9%

1 Review Hide Reviews Show Reviews

  • 5
    Just what I needed

    Posted by Ina on 18th Apr 2020

    I had a hard time finding soft rock phosphate - so glad to have found this! Just what I needed. Great price and quick shipping.