Abstract
Abstract Several estimators of annual basal area increment response to forest fertilization are compared using mean square error. Estimates of mean square error are obtained through uniformity trials. The unadjusted response estimator, that is, the annual basal area increment difference between the treated and the control plots, has an annual root mean square error of approximately 0.1 m²/ha. The other estimators use pretreatment increment difference to improve the response estimate. The easily calculated constant and ratio estimators are satisfactory, with root mean square errors of approximately 0.04 m²/ha initially, rising to about 0.1 m²/ha about 20 years after the pretreatment period. Estimators using time series, covariance, or regression adjustment do not improve upon this. The data has its origin from a broad set of fertilization field trials on Pinus sylvestris L. and Picea abies L. Karst. in the southeast of Norway. For. Sci. 37(1):123-135.
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