Using Foliar Analysis to Classify Nitrogen-Deficient Sites
1984
Comerford, N. B. | Fisher, R. F.
Discriminant analysis was used to evaluate the efficacy of using foliage N concentration (FN), an adjustment of the foliage N concentration based on stand age (FA), and a nitrogen/phosphorus ratio (N/P) to classify N-deficient sites. N/P was the superior index of N deficiency. FA was consistently a more reliable classification technique than FN, but it was not accurate enough for operational use. An N/P ratio of 14 to 15 proved to be the critical ratio. Foliage nutrient analysis was not a useful technique for classifying sites for their long-term response to N fertilization. This is due primarily to the fact that volume response to N fertilization is a function of site and stand conditions after fertilization as well as prior stand N status.
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