Terminology in soil fertility and nutrient management Extension programming has evolved with increasing society emphasis on agriculture and environment interactions. Management of nutrient phosphorus (P) is important to agricultural environmental stewardship. Primarily, the term "Phosphorus Index" has two different meanings in nutrient management planning: the traditional use describes categories of plant response in soil test recommendations; the newer use describes a method of ascribing P movement risk in the landscape. Occasionally the term is used differently in soil science than these two examples. Extension personnel, agronomists, and technical personnel should use the appropriate terms to avoid confusing clientele.
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Oldham, J. (2007). Understanding the Different Phosphorus Indices in Nutrient Management Planning. The Journal of Extension, 45(1), Article 29. https://tigerprints.clemson.edu/joe/vol45/iss1/29