SKU: 82802276275

Calphos Soft Rock Phosphate - Regular Powder (50 lb)

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Description

Calphos Soft Rock Phosphate - Regular Powder (50 lb)Calphos Soft Rock Phosphate is a natural phosphate fertilizer made from finely ground soft rock. It is OMRI listed for organic use and is especially effective in acid soil and slightly acidic environments. This product is a reliable source of calcium phosphate and trace minerals that gradually release into the soil. The slow release of nutrients supports healthy plant growth, improves soil fertility, and provides benefits that last for the long term.

Calphos Soft Rock Phosphate is a natural phosphate fertilizer made from finely ground soft rock. It is OMRI-listed for organic use and is especially effective in acid soil and slightly acidic environments. This product is a reliable source of calcium phosphate and trace minerals that gradually release into the soil. The slow release of nutrients supports healthy plant growth, improves soil fertility, and provides benefits that last for the long term.

Why Use Calphos Soft Rock Phosphate?

Unlike many synthetic phosphate fertilizers, Calphos is a natural phosphate source that feeds plants steadily over time. Because it gradually releases phosphorus, it does not wash away easily with rain. Instead, it stays in the root zone, helping plants build strong root systems and maintain healthy soil structure. This makes it an excellent choice for growers focused on enhancing soil naturally while reducing the need for frequent reapplication.

Calphos contains about 20% P₂O₅, with 3% immediately releasing phosphorus for quick results and the rest breaking down slowly for long term benefits. It also provides around 18% calcium, which helps maintain proper soil pH and supports optimal growth.

Key Benefits of Calphos Soft Rock Phosphate

  • Balanced Nutrition: Supplies phosphorus and calcium phosphate in a form that plants can use steadily.
  • Slow Release Performance: A true slow release fertilizer that feeds plants for up to 5 years.
  • Supports Healthy Soil Ecology: Works well when mixed with organic matter, encouraging microbial activity and improving soil structure.
  • Minimizes Nutrient Loss: Reduces leaching and keeps nutrients available in the root zone.
  • Versatile Applications: Useful for row crops, orchards, trees, and general soil-building programs.

Application Guidelines

For best results, always start with a soil test to understand the nutrient needs and recommended application rates for your soil type and crops.

  • Field Use: Spread about 1 ton per acre on phosphorus-deficient or acid soil.
  • Tree & Orchard Use: Apply 1–10 lbs of Calphos in each planting hole, mixing it well with the surrounding soil.
  • Pre-Planting or Blending: Incorporate into the soil before planting or blend with compost and organic matter for a balanced amendment.

Because Calphos gradually releases nutrients, it provides both immediate and lasting results, reducing the need for repeated fertilizer use.

A Sustainable Choice for Plant Growth

Calphos Soft Rock Phosphate is derived from ancient marine deposits, giving it a natural balance of phosphorus, calcium, and trace minerals. By combining these nutrients, it helps create fertile soils that support healthy root systems, vigorous crops, and healthy plant growth.

Its natural composition makes it one of the most reliable phosphate fertilizers for gardeners and farmers who want to focus on enhancing soil rather than relying on quick fixes.

Why Gardeners and Farmers Choose Calphos

  • OMRI-listed for organic production.
  • Reliable, natural source of phosphorus and calcium phosphate.
  • Excellent for slightly acidic soils and acid soil.
  • Improves fertility while supporting healthy microbial life.
  • Provides both quick and long term nutrient availability.
  • Ideal for row crops, fruit trees, and soil-enrichment programs.

Available Sizes

This 50 lb bag is perfect for larger gardens, farms, and orchards. For smaller applications, Calphos Soft Rock Phosphate is also available in a convenient 5 lb bag.

For smaller applications, Calphos Soft Rock Phosphate is also available in a 5 lb bag.

Explore more options in our High Phosphorus Fertilizer Collection or shop the full range in Fertilizer & Growing Supplies.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 82802276275

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Mad Jack
Battle Creek, US
★★★★★ 5
Inexpensive walls.
Color: Grey, Size: 34" - 3 Panel, Color: Grey, Size: 34" - 3 Panel
We had a hot request for a workstation in the warehouse with some privacy. These have worked great. Easy to assemble. They are lightweight and stable. This was an inexpensive solution that looks professional. Our client loved it.
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Reviewed in the United States on August 1, 2025
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Amber
Bozeman, US
★★★★★ 1
Dont wait! Assemble right away! Just in case you need to return it.
Color: Black, Size: 22" - 4 Panel
Ok, I like the idea of this but the assembly is frustrating. One side lined up perfectly with the holes however, the small bars that connect the screen to base is not lining up. I think it's do the fabric the screen or divider is made of. It's not stretchy. I brought this months ago and just opened it today. I'm upset and don't even think returning it is possible. If the material was a bit longer or stretchy to give a little room to work with this divider would be great. However, I'm not sure what I can use it for since I'm unable to attach it to the bottom. Beware! Don't wait like me. Tip for the manufacturer. Next time invest in Velcro dividers so the fabric can be adjusted with ease. Literally if I take the screen off the frame aligns perfectly. However, it defeats its purpose of privacy. I might buy some material myself and create a more flexible divider. Or I'll buy Velcro myself and attach to the bottom. I don't know yet.
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Reviewed in the United States on December 15, 2025
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creativecow
West Palm Beach, US
★★★★★ 5
Game-Changer for My Space!
Color: White, Size: 4 Panel Basic
I recently purchased the Kecreque 4-Panel Room Divider, and it has completely transformed my living area. At 88" wide, it provides ample coverage, creating a private nook in my open-concept home. The white polyester fabric is not only sleek and modern but also wrinkle-resistant and easy to clean—just a quick wipe with a damp cloth, and it looks brand new. Assembly was a breeze; I had it set up in about 20 minutes. The metal frame feels sturdy and durable, and the three extra-wide metal feet offer excellent stability, ensuring it doesn't tip over easily. I love how the panels are connected with flexible buckles, allowing me to adjust the configuration to suit my needs—be it a straight line or an angled setup. This divider has been perfect for creating a dressing area in my bedroom, and I've also used it to section off a workspace in my living room. Its versatility is unmatched, and it folds down compactly when not in use, making storage hassle-free. If you're looking for a stylish, functional, and easy-to-use room divider, I highly recommend this one. It's been a fantastic addition to my home!
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Reviewed in the United States on June 7, 2025
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Megan
Dallas, US
★★★★★ 5
Sturdy and Functional
Color: White, Size: 4 Panel Basic
I got this to replace a poor quality divider that I tried first, and this thing is the best! It is easily folded, stands sturdily, easy to assemble, and the fabric looks great. Very very happy with the quality for the price.
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L. E. Morales
Phoenix, US
★★★★★ 1
Arrived damaged
Color: Black, Size: 4 Panel Basic
Unfortunately, very cheaply made. It arrived with one of the connecting tubes cracked horizontally. Possibly due to bad welding. It is quite a headache to assemble. It was delivered on time but returned for a refund.
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Reviewed in the United States on April 8, 2026

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