SKU: 10244307969
calcium phosphate fertilizer for plants

calcium phosphate fertilizer for plants Calphos Soft Rock Phosphate (5 lb bag) – Grow Organic

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Description

calcium phosphate fertilizer for plants Calphos Soft Rock Phosphate (5 lb bag) – Grow OrganicEnhance soil fertility and promote strong root development with Calphos Soft Rock Phosphate (5 lb), a natural source of phosphorus and calcium. This slow release mineral fertilizer provides essential nutrients that support plant growth, improve flowering, and encourage fruit and vegetable production. Ideal for organic gardening, it gradually breaks down in the soil, supplying a long lasting source of phosphorus without the risk of leaching. Phosphorus

Enhance soil fertility and promote strong root development with Calphos Soft Rock Phosphate (5 lb), a natural source of phosphorus and calcium. This slow-release mineral fertilizer provides essential nutrients that support plant growth, improve flowering, and encourage fruit and vegetable production. Ideal for organic gardening, it gradually breaks down in the soil, supplying a long-lasting source of phosphorus without the risk of leaching.

Phosphorus is a key nutrient for root establishment, energy transfer, and bloom development, making Calphos an excellent choice for root vegetables, fruiting plants, and flowering ornamentals. In addition to phosphorus, this soft rock phosphate contains calcium, which strengthens plant cell walls and contributes to overall plant resilience. Together, these nutrients support vigorous plant growth and improved yields.

Easy to apply, Calphos Soft Rock Phosphate can be mixed into the soil before planting or used as a top dressing to provide continuous nourishment throughout the growing season. It is suitable for vegetable gardens, orchards, flower beds, and general soil improvement. The finely ground powder ensures efficient nutrient absorption, helping plants thrive in a variety of growing conditions.

Key Benefits:

  • Rich Nutrient Content: Averages 20% P2O5 (3% immediately available), 18% calcium.
  • Slow-Release Formula: Provides phosphorus and calcium for up to 5 years after application.
  • Supports Root Growth: Strengthens root systems and improves plant resilience.
  • Improves Soil Microbial Activity: Enhances beneficial bacteria for better soil health.
  • Reduces Nutrient Loss: Stays in the soil, minimizing runoff and maximizing plant uptake.
  • Versatile Application: Ideal for vegetables, trees, perennials, and general soil enrichment.

Application Guidelines:

  • General Use: Apply 5 lbs per 100 square feet or 1 ton per acre on phosphorus-deficient soils.
  • Trees & Perennials: Use 1-10 lbs per planting hole, depending on plant size.
  • Pre-Planting: Mix into the soil for best nutrient absorption.
  • Top-Dressing: Apply around plants as a slow-release nutrient source.

For larger applications, Calphos Soft Rock Phosphate is also available in a 50 lb bag.

Learn More About Soft Rock Phosphate:

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SKU: 10244307969

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Greg from MidW
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★★★★★ 3
Does the job but dangerous to walk with!
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Reviewed in the United States on December 24, 2025
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Texgurl
New York, US
★★★★★ 4
Does the trick
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Reviewed in the United States on April 6, 2026
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Amazon Customer
New York, US
★★★★★ 5
The really work!
Bought these or a friend with severely dry cracked feet. The change was significant and immediate. They wore them around the house for a day and that night they could already feel the difference.
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Lina
San Leandro, US
★★★★★ 5
Fabulously bizarre and effective
These silicone socks have to be the strangest item I have ever ordered from Amazon. However strange they are, I was pleasantly surprised with them. My order came with two pairs, and I took one pair out to wash before use. I laughed at handling them then because they were a cross between hospital socks and leftover mannequin skin…trippy. The socks dried fast, so I put on foot lotion and put the socks on. The socks are beige skin tones that cover the entire foot up to the ankle, basically booties. The silicone is very soft and makes putting on and taking off the socks easy. They are also surprisingly easy to walk around in because the bottoms have grips, again, like hospital socks. I walked on tile, hardwood, and carpet with no slipping. The booties also stayed in place with no issues. I was concerned my feet would sweat, but that didn't happen. I was able to wear them for 3 hours without sweaty feet. When I took them off, my feet were a lot more soft than before or if I had used regular socks. For reference, my feet are not terrible, but the skin around my toes is dry and peeling from my picking(gross, I know). The socks I got are a size large, which worried me because they are big, but the site said for my shoe size (9) that's what I should order, and they were right. They are the perfect size and stretchy for room. I can't believe how cool and well-thought-out these socks are, on top of working. Honestly, these are among the top 20 favorite items I've ordered from Amazon. They may look incredibly strange, and they are, but they work wonders.
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Reviewed in the United States on June 5, 2025
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Louisville, US
★★★★★ 3
Not well made
I have used these for 2 weeks now and one of them has a hole in the sole... I won't ever buy them again
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