A 2019 review of P fertility research, 4R Management of Phosphorus Fertilizer in the Northern Great Plains: A review of the Scientific Literature. Dr. Cindy Grant (AAFC retired) and Dr. Don Flaten (U of M) completed a review of the 4R principles for phosphorus management. With input from a technical advisory panel of western Canadian soil scientists, the document updates the Red Book chapter on P. This new review of P fertilizer research on the Northern Great Plains encourages agronomists and farmers to implement the 4Rs of nutrient management using ‘right’ source, rate, placement and timing of P fertilization.




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