Genetic variation of Eucalyptus obliqua in field trials.
Gives results after four years of trials in Tasmania and Victoria of E. obliqua seedlings (from 22 provenances throughout the range of the species in south-eastern Australia) grown from the same seed-lots as the seedlings used in earlier greenhouse experiments [cf. FA 33, 2075]. Significant variation was shown to exist among several growth parameters and for survival. The ranking of the provenances for height was consistent on the two low-altitude planting sites and similar to that noted in the greenhouse study. Within provenances, there were significant differences between families for growth and survival. It is concluded that genetic improvement of E. obliqua is possible, not only by selecting the most suitable provenances for particular sites but also by selecting superior individual trees within provenances.