Date of Sowing and Nursery Growth of Provenances of Pseudotsuga menziesii Given Two Fertilizer Regimes

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Abstract
Seed was collected from natural stands of P. menziesii growing at 250, 520 and 880 m elevation in Oregon, USA. Seed was also obtained from a cross between trees of 250 and 520 m. The seed was sown on 5 dates between April 23rd and July 8th, 1974. Half the plots were left unfertilized in 1974; all plots were fertilized in 1975. Early sowing significantly increased serum height and diameter, advanced the date of bud set and altered the period of stem elongation, extending it in the 1st yr and shortening it in the 2nd. Fertilizer increased seedling height and diameter and the elongation period if seeds were sown early, but not if they were sown late. They were significant differences among provenances from different elevations for stem diameter, date of budset and date of budflush. Interactions between provenances and dates of sowing were significant for dates of bud set and bud flush, and for stem height, diameter and form. Comparisons of young material of different provenances must take into account the effect of cultural conditions, particularly conditions altering the length of the elongation period.