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Thesis (M.S.)—University of Nebraska—Lincoln, 1971. Department of Horticulture and Forestry.


Copyright 1971, the author. Used by permission.


The objective of this study was to identify genetically controlled variation in a collection of Juniperus virginiana sources made throughout the Great Plains Region. The characteristics studied were winter foliage color, height growth, time of growth initiation, duration of growth and survival.Various photoperiod and temperature regimes (and combinations of both) were used to fulfill this objective.

This research was conducted in five parts:

  1. Seedbed observations – Foliage color was recorded and seedling survival determined and comparisons were made among the sources.

  2. Provenance Plantings – Foliage color differences and survival were observed and recorded.

  3. Photoperiod Study – Growth initiation, length of growing period and total height growth were measured and recorded.

  4. Photoperiod and Temperature Study – Growth initiation, total height growth, and foliage color changes were measured and recorded.

  5. Growth Duration Study – Time of growth initiation, total height growth, foliage color, and time the growth ceased were recorded.

Advisor: W. T. Bagley