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.

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SKU: 82802276275

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4.7 ★★★★★
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C
Verified Purchase
C. Appleyard
Houston, US
★★★★★ 5
A wonderful book for all Christians who wish to defend the credibility of our bible
Format: Paperback
Brant Petrie is a wonderful Catholic Bible Scholar, having both a deep love and understcanding of his own faith and the faith of Jesus of Nazareth, Judaism. Everyone of his books and videos provide deeper insight who is Jesus, the ancient faith He handed on and even why it grew as swiftly as it did...always using the Old Testament to enlighten our understanding of the New. He couldn't do this if he wasn't completely convinced himself of Who Jesus is and the credibility of the Scriptures that reveal Him to us. That is what this book is about. Petrie takes you point by point through the arguments that modern scripture scholars and atheists put forth about the New Testament, that we have no idea who wrote the Gospels, they were written anonymously, they are myth or folktale etc. The most stunning reality is that these people literally ignore the facts; they ignore common sense The second topic he tackles is the assertion that Jesus wasn't divine because He never claimed to be God. They dismiss John's gospel, saying the idea that Jesus was God, was a later development and clearly not believed from the beginning as witness by the fact that no where in the Synoptic Gospels does Jesus claim divinity. Petrie, again using his understanding of Judaism and how ideas are expressed in the culture, clearly demonstrates that while, Jesus never stands up pounding his chest saying, "I am God", He very distinctly, even explicitly makes His divinity known. If He hadn't, the high priest would not have rend his garments and there would never have been a crucifixion. The case is made simply and in a straight forward manner. Arguments that all of us can use, with love, when the credibility of scripture is questioned. He also has a pleasant writing style. He has a wonderful sense of humor in his videos and while it is less obvious in the book, his gentle strength is quite evident. If you love scripture and the Christian faith, this is a book you will want to read.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 18, 2020
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Lawman
Omaha, US
★★★★★ 5
The best "Jesus book" outside the Bible
Format: Kindle
If you are looking for a dry academic tome that spends page after page delving into the minutiae of little known biblical passages, you need to look someplace else. If, however you are looking for a fresh, dynamic and eye opening book tackling the big questions about who Jesus claimed to be, the reliability and authorship of the Gospels, and other questions surrounding the life and ministry of Jesus, then this is the book for you. Written by a well respected academic but for a non-specialist readership, Dr. Pitre's writing is engaging while not being breezy. He uses footnotes to back up his assertions but not so many as to overwhelm the reader. Don't get me wrong, I like a weighty academic tome as well as the next nerd. I would strongly recommend one of Dr. Joshua R. Brotherton's books. But nerds aren't Dr. Pitre's only intended audience. It's all of us who have been bombarded with claims that the gospels are unreliable and anonymous, written well after the lifetime of the Apostles. That Jesus never claimed to be divine or that the resurrection is nothing more than myth. It addresses these and other issues in a way that makes you resolve to buy copies of his book for family and friends even before you're halfway through the book. I know I did and I bet you will to.
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Reviewed in the United States on June 8, 2024
R
Verified Purchase
Robert C.
Port Orchard, US
★★★★★ 5
An Excellent Summary Defending The Synoptic Gospels and Jesus Christ's Claims of Divinity
Format: Hardcover
This book is an excellent summary that refutes the arguments made by modern theologians and scholars of the Bible that claim that the Gospels were of anonymous authorship, written late in the 1st Century AD, and Jesus of Nazareth never claimed to be divine. Bart Ehrman's (an avowed atheist that seems motivated to denigrate Christianity) shoddy scholarship is frequently given as an example to be refuted. The author cites the Apostolic Fathers and more recent scholars to show that the claims made by the revisionists are incorrect. There are several detailed 5 Star reviews, so I won't duplicate their praises for Dr. Pitre's book. The book is a quick read and there are numerous end notes. A minor criticism is that the book lacks a bibliography, but the sources are fully identified within the end notes. The author makes a couple of very interesting observations concerning the Transfiguration of Jesus and how Jesus fulfilled Scripture (namely, the Book of Jonah) that I had not considered before. One of the negative reviews cites the notes in the New American Bible as evidence that Dr. Pitre's book is incorrect. While it is true that the Catholic Church in the U.S. uses the NAB translation in its liturgy, other Biblical scholars dispute the notes included in that edition of the Bible. A similar problem exists with the notes included with Oxford's Catholic Study Bible. The notes were written by modern revisionists. I suppose you have to decide whether to accept the words of the Apostolic Fathers (i.e., men that either were or knew the Apostles) and Jesus Christ, or if -- 2000 years later -- you're too sophisticated to accept the word of some ancient guys. The author is Catholic, and the book has been granted an Imprimatur. However, since this book does not get into the weeds concerning doctrinal differences, it should be of value to any Christian.
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Reviewed in the United States on January 15, 2024
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Dick
San Leandro, US
★★★★★ 4
Good but more academic
Format: Hardcover
I love Brant Pitre, especially his books Jesus and the Jewish Roots of the Eucharist and Jesus the Bridegroom. I would say those books should be required reading for anyone who is catechist or is involved in RCIA as Catholics. This book is good, however it is primarily an academic work where Dr. Pitre takes on the Historical Jesus movement and Dr. Bart Ehrman in particular. In this book he goes on to show that the gospels were written within a few decades of Jesus death by the disciples that have given their names to the gospels. He uses his knowledge of Jewish faith and culture to show that Jesus really does claim to be God in all the gospels, not just the Gospel of John. It is a good book but not one that I would find useful on a regular basis.
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Reviewed in the United States on March 14, 2016
R
Verified Purchase
Russell P. Hills
Natrona Heights, US
★★★★★ 5
BEST BOOK IN 20 YEARS
Format: Hardcover
BEST BOOK that I have read in 20 years. This should be required reading in Christian schools. Every Christian who has graduated from high school should read this book. As one who has studied Church History, Hebrew, Aramaic and Greek myself, I had become very disappointed in what passes as scholarship, even among Ivy Leage graduates, in the 21st century. HOWEVER, Dr. Pitre's book is a great encouragement that there really are people "out-there" that display genuine scholarship. With Appreciation, Russ Hills, Ph.D.
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Reviewed in the United States on January 13, 2026

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