Abstract
A site-productivity model for Norway spruce on fen peat in central Ireland was derived by stepwise regression of measured soil data on yield class (the expected maximum mean annual volume increment for the crop, expressed in cubic metres per annum per hectare). Soil C/N ratio, soil air space and hydrogen ion concentration explained 73% of the observed variation in yield class. The results indicated that the yield class of Norway spruce on fen was correlated with the physical properties of the peat and that, assuming adequate inputs of P and K, this species will be most productive on poorly decomposed, well-drained fen which exhibits a botanical composition indicative of relatively poor nutrition at the time of peat formation.
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