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Realized genetic gain in Pinus radiata from 850 seed-orchard seedlots grown commercially in the central North Island, New Zealand. Part 1. Growth


New Zealand Journal of Forestry Science 27(2): 142-157
Realized genetic gain in Pinus radiata from 850 seed-orchard seedlots grown commercially in the central North Island, New Zealand. Part 1. Growth
Analysis of covariance models of diameter and height of 13-year-old Pinus radiata D. Don grown in commercial forests in the central North Island formed the basis for comparing average stand tree diameter (d) and mean top height (MTH) of non-seed-orchard and "850" seed-orchard seedlots. Both the d and MTH models used several groupings of seedlots to determine the impact of these first-tree selections on d and MTH. The models included several variables to remove other growth-affecting factors. For the modelling of d, altitude and crop stocking were used, and the MTH model used site index. The analyses of covariance for both d and MTH, show no significant improvement overall of "850" seed-orchard seedlots over Kaingaroa climbing select or Kaingaroa (bulk) seedlots at age 13. The Gwavas "850" seed-orchard 25-clone seedlots did show a significant improvement in if over Kaingaroa bulk, but not over Kaingaroa climbing select. The results of this study differed from those of large-plot genetic gain and progeny trials. This may be for several reasons. The first 8 to 10 years of seed production from the "850" seed orchards contained seed of poorer quality than later seed production. The assessment of P. radiata at age 13 may be too early for the detection of divergence of "850" seed-orchard material from non-seed-orchard material to be noticeable in commercial stands. Superior "850" seed-orchard seedlots may have been better than those planted in commercial stands.


Accession: 009303675



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