Market prices of selected fertilizers & raw materials (monthly average) April 21, 2017August 23, 2019 sofia Source: Fertecon, US EIA, Canadian Gas Price Reporter, Nutrien Source: https://www.farmprogress.com/story-weekly-fertilizer-review-0-30765, https://www.nutrien.com/sites/default/files/uploads/2019-07/July%202019%20Market%20Update.pdf Data Base