We've reviewed the KAP study. It was a very short-term study taken right before spring seeding, which is a very volatile period in the market. Farmers are trying to secure the last bit of fertilizer to put in their crops, so it's not the ideal time to buy fertilizer in most cases.
Agriculture Canada does the most comprehensive review of this. They have two independent organizations that review the marketplaces of Manitoba, North Dakota, Minnesota, Ontario, and the border states in the United States. They take samples of prices throughout the year and do a very comprehensive study. It is far more comprehensive than the very narrow snapshot taken during the volatile period of the season that KAP did.