Black Friday Sale Nov 10 - 30!  Save 25% on select KiS products + exclusive bundle deals. 
Free
shipping
1 2

Calphos Soft Rock Phosphate 0-3-0

5.0 out of 5 Read 6 reviews
$ 3600
Taxes and shipping calculated at checkout.
Size
Reusing your soil? Get a soil test with analysis and add only the amendments your soil is actually missing. Learn about soil test analysis or take our quick quiz.

Long-lasting phosphorus and calcium

Calphos soft rock phosphate is a natural colloidal clay with about 18% phosphorus and 15% calcium plus trace minerals. It is insoluble in water, so it stays where you put it and won't leach away.

Key things we want you to know

  • How to apply: till it in, ideally right under the seed or transplant, since annuals take up to 60% of their phosphate in the first weeks.
  • Rate: about two tons per acre together with other amendments.
  • Spreads easily: fine material that works in common fertilizer spreaders.

Application & Mixing
  • Place it at the root: An annual plant takes up to 60 percent of its total phosphate needs in the first few weeks of life, so soft rock phosphate used directly under the seed or transplant at planting time is the best method, especially in low-acid or high-alkaline soils. It is still beneficial in slightly acid to neutral soils.
  • Work it in: It needs to be plowed under or tilled into the soil.
  • Rate: About two tons per acre together with other amendments.

Information derived from www.dirtdoctor.com.

Lab Reports & Resources

Reviews (6)

Customer Reviews

Based on 6 reviews
100%
(6)
0%
(0)
0%
(0)
0%
(0)
0%
(0)
R
ReJ
My go to

My go to fertilizer!

E
Eva Jones
I transplanted tomatoes a few weeks ago using

I transplanted tomatoes a few weeks ago using this and I have tomatoes on the plants already!

B
Beatrice Aviles
Great quality 100% recommend it

Great quality 100% recommend it.

R
Reed Baylis
Great price, shipping, and quality

Clean, reliable, and affordable products!

A
Anonymous
Great product

I micronized and used hand watered in

Growing at scale?

Get a freight quote