Frank C. Sorensen

• Self-fertility of a central Oregon source of Ponderosa pine
• The seed orchard tree as a pollen sampler
• Correlation between dates of floral and vegetative bud flush in Douglas-fir
• Effect of date of cone collection and stratification period on germination and growth of Douglas-fir seeds and seedlings
• Genetic variation in rootability of cuttings from one-year-old western hemlock seedlings
• Performance of wind-pollination families and intra- and inter-stand crosses on contrasting forest soils
• Photosynthesis, respiration, and dry matter accumulation of Douglas-fir seedlings from different geographic sources and growth at different temperatures
• Stratification period and germination of Douglas-fir seed from Oregon seed orchards
• Stratification requirements for germination of western larch (Larix occidentalis Nutt.) seed
• The seed orchard tree as pollen sampler
• Two-year results of a west-east transect-provenance test of Douglas-fir in Oregon