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New Zealand Journal of Forestry (1987) 32(2): 24–25
©New Zealand Institute of Forestry

Research article
Root growth capacity of Cupressus macrocarpa and Pinus radiata seedlings

J.M. Balneaves

Nursery seedlings of macrocarpa and radiata pine were lifted at about four-weekly intervals during winter, and their roots were exposed for 0, 30, or 60 minutes. Seedling water potential and root growth capacity were then assessed. The root growth capacity of macrocarpa seedlings was greater than that of radiata pine, particularly later in the lifting season. Radiata pine seedlings lifted early in the winter (May 30) showed maximum root growth capacity, and this decreased for all subsequent liftings. Root exposure decreased seedling water potential and subsequent root growth capacity. In macrocarpa seedlings water potential declined significantly, but root growth capacity declined only slightly. In radiata pine both water potential and root growth capacity declined after root exposure.
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