Abstract
The province of Ontario is divided into three major jack pine populations as a result of grouping 12 seed sources on the basis of growth characteristics, 20 years from sowing. Migration following glaciation is postulated as a cause of population differentiation.Growth of trees from the 12 stands was positively but weakly correlated with growing degree days. However some northern sources flourished in southern plantations. Consistent growth differences were found between some geographically close sources, justifying further, more intensive sampling to identify the most productive sources of seed for each of the major areas of jack pine silvicultural activity in the province.
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