As stated, most produce in Calgary grocery stores that is labeled 'organic' has no additional information. Selection is very limited in any case.
Canned vegetables with 'organic' on the label are an exception, they have a note that they are certified by Quality Assurance National, which is the organization selected by by the USDA, National Organic Program. At the NOP website, they speak of lists of allowed or prohibited substances, etc., but I couldn't find any specifics at their website (Most organic produce in stores in Calgary comes from the U. S.).

Fresh produce with the 'organic' label, as noted before, is expensive in Calgary (e. g., 3-4 organic potatoes cost as much as a 5 lb. bag of unlabeled potatoes).