What kind of phosphate is present in fertilizers?, some say that the

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SUMMARY

The primary type of phosphate used in fertilizers is orthophosphate, although there is some debate regarding its prevalence. Historically, superphosphate, a mixture of gypsum and monocalcium phosphate, was common, but the industry has largely transitioned to triple superphosphate, which is produced by treating insoluble calcium phosphate (Ca3(PO4)2) with phosphoric acid. Both superphosphate and triple superphosphate yield chemically identical products, Ca(H2PO4)2. Additionally, ammonium phosphate is also utilized in fertilizers, indicating a diverse range of phosphate types in use.

PREREQUISITES
  • Understanding of phosphate chemistry, specifically orthophosphate and polyphosphate.
  • Knowledge of fertilizer production processes, including superphosphate and triple superphosphate.
  • Familiarity with the chemical composition of calcium phosphate (Ca3(PO4)2).
  • Awareness of the impact of different phosphate types on soil health and plant growth.
NEXT STEPS
  • Research the production process of triple superphosphate and its environmental implications.
  • Explore the effects of different phosphate types on lawn health and soil quality.
  • Investigate the historical transition from superphosphate to triple superphosphate in the fertilizer industry.
  • Learn about the role of gypsum in fertilizer formulations and its benefits.
USEFUL FOR

Agronomists, fertilizer manufacturers, landscape professionals, and anyone involved in agricultural practices or lawn care will benefit from this discussion.

chemistry93
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What kind of phosphate is present in fertilizers?, some say that the orthophosphate is the one mostly used in fertilizers however some state otherwise, hoping you guys have the answer :)
 
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They used to put "superphosphate" in fertilizer, which is a mixture of gypsum and monocalcium phosphate but nowadays they just treat insoluble calcium phosphate (Ca3(PO4)2) with phosphoric acid instead of sulfuric acid and make something identical without the gypsum and call it "triple superphosphate". Both products are chemically Ca(H2PO4)2. I've seen ammonium phosphate used as well. There is no single type of phosphate used (ortho or poly) but most is ortho I believe.

http://www.extension.umn.edu/distribution/cropsystems/DC6288.html

My buddy Malcolm Beck has been watching the phosphate market for some time and he noticed that when the industry switched over to triple superphosphate the lawn problems began in San Antonio. He attributes it to the type of phosphate used but I'm unconvinced. I guess you could just add gypsum to regular fertilizer and make your own "super".
http://www.malcolmbeck.com/articles/phosphates-probemsandsolutions.htm
 

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