With high fertilizer prices, ongoing drought, and potential for nitrogen carryover from the 2021 season, it is important we assess nitrogen is available in the soil for the 2022 growing season. Dr. Don Flaten (Retired University of Manitoba professor) and John Heard (Soil fertility specialist with the Government of Manitoba) provide insight into how mineralization and immobilization play a role in your nitrogen fertility plan. Hint: your expected nitrogen release value may not be as reliable as you think!