Abstract
In a glasshouse environment, and in field trials with trees up to four years of age, the effect of genetic improvement on the early nutrition and growth of radiata pine was examined. In the glasshouse trial, on a range of forest soils, there was no effect of genetic gain (expressed as growth and form rating) on either seedling biomass or nutrient content; in field experiments, correlations between genetic gain (breeding value and growth and form rating) and growth (height, root collar diameter, or both) became apparent from Age 2 years at both sites. It was concluded that the genetic improvement of radiata pine seedlings would not be needed to be taken into account if seedlings were to be used before the age of six months as `bio-assay' indicators of changes in soil quality.
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