New Forests

, Volume 31, Issue 1, pp 1–24 | Cite as

Field Performance of Three Stock Sizes of Douglas-fir Container Seedlings Grown with Slow-release Fertilizer in the Nursery Growing Medium

  • Diane L. HaaseEmail author
  • Robin Rose
  • John Trobaugh


Containerized coastal Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings were grown with conventional soluble fertilizer and supplemented with one of four slow-release fertilizers (SRF treatments) or unsupplemented (control treatment). Seedlings were outplanted to two sites in 1998. At the time of outplanting, SRF incorporated into the growing medium resulted in larger seedlings with higher foliar nutrient concentrations as compared to conventionally fertilized seedlings. After four growing seasons, SRF-amended seedlings at both sites had significantly greater height, basal stem diameter, and stem volume, with increases up to 19, 21, and 73%, respectively, as compared to conventionally fertilized seedlings. Additionally, three stock sizes were compared at one of the sites. Increasing stock size resulted in increased growth during the first two seasons, enabling larger stock to maintain their size advantage. Seedling responses to SRF are attributed to larger initial size, increased internal nutrient reserves at planting, and continued fertilization after planting.


Container production Fertilization Reforestation Seedling nutrition Vector diagrams 


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Copyright information

© Springer 2006

Authors and Affiliations

  1. 1.Nursery Technology Cooperative Department of Forest ScienceOregon State UniversityCorvallisU.S.A
  2. 2.Washington Department of Natural ResourcesWebster Forest NurseryOlympiaU.S.A

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