Premium
Using Foliar Analysis to Classify Nitrogen‐Deficient Sites
Author(s) -
Comerford N. B.,
Fisher R. F.
Publication year - 1984
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1984.03615995004800040042x
Subject(s) - human fertilization , phosphorus , nitrogen , nutrient , nitrogen fertilizer , linear discriminant analysis , mathematics , zoology , chemistry , agronomy , biology , statistics , ecology , organic chemistry
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.