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A Phenological Study of Ponderosa Pine Seedlings

Effective cultural operations at a nursery are often influenced by the growth activity occurring within plants. This study was undertaken to determine the growth pattern and growth cycles of ponderosa pine tops and roots. The work was done while the author was assistant nurseryman at the Bend Pine Nursery.1 Ponderosa pine (Pinus ponderosa Laws) is produced at the Bend Pine Nursery for the reforestation of sites within an area of longitude 117° to 124° West, latitude 42° to 49° North, and elevations from 1,500 feet to 6,500 feet. Within this area are climatic, edaphic, physiographic, and biotic factors that have produced variations in the species to make it more adaptable to its natural environment. Seed collected from these localized sites act differently when sown at the nursery. A careful study of the species and its variations may give a nurseryman an opportunity to adopt techniques in the management of his nursery to produce a more satisfactory tree for field planting. Method 1-0 2-Three seed lots were selected from the 1965 sowing schedule representing variations in growth habits at the nursery in past years. These seed lots were collected on the Winema, Rogue River, and Okanogan National Forests.

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Author(s): James W. Betts

Publication: Tree Planters' Notes - Volume 20, Number 3 (1969)

Volume: 20

Number: 3