Abstract
SYNOPSIS Pruning trials were established in stands of Pinus radiata in three plantations in different climatic regions. The objective of the experiments was to assess the effect of a first, second, third and fourth pruning on mortality, on diameter, height and volume increment and on the number, the mean diameter and the mean length of epicormic shoots. There were 12 trials with three replicates in each trial. Analyses of variance were calculated for the response variables mortality, diameter and height increment and epicormics per tree and per plot. The observed diameter and height increments were adjusted for diameter and height at the beginning of the trial as covariate. Principal components transformation and factor analysis were applied to the above response variables.
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