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The Influence of Pretreatment Forest Soil Variability on Interpretation of Posttreatment Results
Author(s) -
Slay J. Melinda,
Lockaby B. G.,
Adams J. C.,
Vidrine C. G.
Publication year - 1986
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/sssaj1986.03615995005000060042x
Subject(s) - analysis of covariance , environmental science , spatial variability , soil science , covariate , covariance , variance (accounting) , forestry , statistics , mathematics , geography , accounting , business
Analysis of covariance procedures were used to evaluate differences in forest soil chemical properties among four site preparation techniques. Comparisons were made between analyses of variance adjusted with pretreatment soil chemical data used as covariates and unadjusted analysis of variance results. These comparisons indicated that failure to adjust for pretreatment spatial variation in soil chemical properties would lead to misinterpretation of the study results. This misinterpretation involved different rankings (for unadjusted vs. adjusted) of the site preparation treatment effects on soil N, P, K, Ca, and Mg concentrations.