Silvicultural Characteristics of Radiata Pine in Tapanui District

Authors: I.D. Whiteside
Publication: New Zealand Journal of Forestry, Volume N.Z.J.For. 1959, Issue N.Z.J.For. 8(4) 1962, pp 594-607, Jan 1962
Publisher: New Zealand Institute of Forestry

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Abstract: Various growth characteristics of radiata pine (P. radiata D.Don) in the Tapanui District that are considered to be of some silvicul-tural significance were investigated.
It was found that for all purposes of practical management maximum green crown depth is dependent solely on stand stocking. The relationship between stocking and maximum, green crown depth was established, and thinning schedules to maintain the green crowns at any particular desired height level can now be devised.
Branch development throughout the crown in young unthinned stands is described. Also illustrated are the effects of initial spacing and thinning on the branch diameters encountered and knotty core diameters obtained in pruning according to various pruning schedules. Wider initial spacing or thinning prior to pruning are shown to cause considerable increases in branch and knotty core diameters, and the conclusion is reached that first thinning should be delayed until pruning to 18 feet is completed.
The relationship between the diameter of the largest branch in a whorl and the knotty core diameter resulting from pruning the whorl is demonstrated.
Finally the effects of green pruning on increment are illustrated. With low pruning from 0-6ft, a knotty core diameter of 5 in. can be obtained without excessive depression in diameter or height growth. However, for pruning from 6—12 feet, a core of 6 inches in diameter is the smallest that can be expected.

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