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Correlation of height growth in black spruce picea mariana with site factors of the provenances



Correlation of height growth in black spruce picea mariana with site factors of the provenances



Silvae Genetica 28(4): 122-124



A black spruce provenance study, based on 26 Newfoundland [Canada] provenances, was started in 1968 in a nursery at Pasadena in western Newfoundland, using bulked open-pollinated seed. The 5-replicated randomized complete block design with 100-seed plots was used. Four year heights of 8 randomly selected seedlings in each plot were determined in Oct. 1971. The effects of 9 environmental factors of the sites of the provenances on height growth were studied to identify the subject of those which contributed most to height growth and to assess the usefulness of the subset as a predictor. Analysis of variance was performed with multiple and equal number of observations per plot, using the mixed model. A stepwise zig-zag regression procedure was adopted using the mean provenance height as the dependent variable and the 9 environmental factors of the sites of the provenances with all their pair-wise cross-products and squares as independent variables. No independent variable is correlated with the dependent variable in a simple linear manner. The significant subset of independent variables comprised the following: square of the latitude, interaction of longitude and mean precipitation during the period May-Sept., interaction of mean number of frost-free days and mean number of days during the annual growing period and interaction of the number of frost-free days during the annual growing period and the day length on June 21.

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