I checked the OMRI book this morning (Organic Materials Review Institute, www.omri.org) . Looks like calcium chloride is allowable.
It has an "R" status, meaning "materials may be used on certified organic land and crops only with certain restrictions or limitations". It's class is "F" for fertilizer and "cpa" for "crop production aid". The annotation reads "Nonsynthetic sources only".
 
This company is listed to sell it...
 
Bio-Guard Agronomics ICN
www.calcium25.com (sorry.. coming soon)
Falls Church, VA
800 673-8502
 
They have 5 difference products listed... for fruit trees, field corn, grains, veggies, wheat and rice.
 
Don't mean this to be an endorsement.. sorry Allan if listing a company is inappropriate... just thought someone might have time to check it out further.... oh.. and he's practically a neighbor of yours...
 
Perry
He said it could be used in certified organic farms in the U.S.

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