Western USA Engelmann and Colorado blue spruce provenance trials

Project number: EP 705.04

District: Rocky Mountain Forest District

Objective

To evaluate the growth performance of western USA Engelmann and Colorado blue spruce provenances in southwestern British Columbia.

​Treatment

Seedlings from 114 seed sources from eight western states are tested. Seedlings were provided by G. Rehfeldt, USDA, Forest Service, Moscow, Idaho.

Layout

• The site contains three blocks
• A nine-tree square plot represents a provenance. Provenances are randomized within each block
• The middle seedling of each plot is marked with a wooden stake bearing a metal tag identifying the block and the provenance

History

• 1991 plantation establishment and initial height measurements
• 1993 third-year height measurements and maintenance
• 1996 sixth-year height measurements and maintenance
• 2000 tenth-year measurements and maintenance