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New Zealand Journal of Forestry (1973) 18(1): 109–114
©New Zealand Institute of Forestry

Research article
Further notes on Woodhill Radiata Pine pruning trial A. 383.

P. Berg

In the interval between low pruning radiata pine at predominant mean height (pmh) 5 metres and first thinning at pmh 14 m, individual stems show marked changes in dominance. Pruned dominants in a high density pruning treatment display greater diameter growth than pruned dominants in a low density pruning treatment, the greater growth occurring on the larger-diameter trees. At about pmh 12 m and with relative spacing of 19%, canopy closure is complete, and associated with more intense crown competition there is a fall from 990 to 430 dominant stems per hectare. Unless thinning occurs at this time to release pruned stems from competition with unpruned dominants, suppression of pruned stems may follow.
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