Abstract

The purpose of this study was to find out if ecological races with different growth rates existed in douglas fir. Seeds were collected from six areas by the Forest Service and the author. A study was made of stem and tap root growth utilizing three photoperiods of varying length. Rate of tap root growth was significant for ecotype suggesting selection for tap root length in the plants from utah and Arizona. Each geographical area represents a growth rate ecotype with a wide break in the data on stem growth.

Degree

College and Department

Life Sciences; Plant and Wildlife Sciences

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