Effect of precision sowing on grade output of 1/0 Pinus radiata seedlings - Edendale Nursery

Authors: J. M. Balneaves, B. S. Fredric
Publication: New Zealand Journal of Forestry, Volume N.Z.J.For. 1983, Issue N.Z.J.For. 28(1) 1983, pp 100-112, May 1983
Publisher: New Zealand Institute of Forestry

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Abstract: In evaluating seedlings grown at uniform spacings in the nursery, height:diameter ratio or height alone gave no indication oj the ability of a seedling to grow away rapidly after planting, but root collar diameter was a useful indicator.

Investigations of root growth potential patterns showed that, with increasing diameter classes, irrespective of initial spacing, root growth potential increased.

If grading of 1/0 radiata pine tree stocks from Edendale Nursery is necessary it would be best to base it on root collar diameter (trees with smaller diameters (<5mm) going to the more benign sites and trees of larger diameter size (6mm<) going to the harsher planting sites) in the first instance and ideally on ODW of shoots and roots if possible.

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