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Abstract: Five years after planting, survival of 2-0 bare root Douglas fir (Pseudotsuga
menziesii) seedlings was high on both burned and unburned plots (89 and 87%, respectively), but
seedling stem height, diameter, and volume were greater in burned than in unburned plots.
259. Helgerson, O.T., S.D. Tesch, S.D. Hobbs and D.H. McNabb. 1989. Survival and growth of
ponderosa pine and Douglas-fir stocktypes on a dry low-elevation site in southwest Oregon.
Western-Journal-of-Applied-Forestry 4(4): 124-128.
Keywords: nursery operations
planting operations
growth
tree/stand health
Abstract: Two stocktypes (1+0 container-grown plugs and 2+0 nursery-grown bareroots)
of ponderosa pine (Pinus ponderosa) and of Douglas fir (Pseudotsuga menziesii) were planted on
a hot, droughty, low-altitude site near Medford, Oregon, which had burned in 1981. The main
objective was to assess the potential for reforesting this type of site. After 5 growing seasons, bare
rooted stock survived (98%) significantly better than plugs (89%); survival did not differ
significantly by species. Douglas fir was taller than pine, pine was larger in diam., and the 2
species had approximately equal stem volumes. Bare rooted stock was consistently larger than
plugs. Results show that these species and stocktypes can provide good reforestation after 5 yr on
this type of site when seedlings are of good quality, are planted properly, and are given good
weed control.
260. Helgerson, O.T., S.D. Tesch, S.D. Hobbs and D.H. McNabb. 1992. Effects of stocktype, shading,
and species on reforestation of a droughty site in southwest Oregon. Northwest-Science 66(2):
57-61.
Keywords: nursery operations
planting operations
tree/stand protection
tree/stand health
growth
Abstract: On hot, dry sites, shading may differentially increase survival of planted Douglas
fir (Pseudotsuga menziesii) according to seedling size, and Douglas fir may differ from ponderosa
pine (Pinus ponderosa) in early survival and growth. The survival and growth of Douglas fir
seedlings (1+0 container-grown plugs and 2+0 bare-rooted seedlings, unshaded or shaded with
cardboard shadecards at planting) and unshaded 2+0 bare-rooted ponderosa pine were compared
on a droughty south facing clear felling in Oregon. The site was clear felled and burned in 1982
and the seedlings were planted in 1983. Shading did not significantly increase survival of plugs,
possibly because of a wetter than normal first summer, nor did shading affect growth of either
Douglas fir stocktype 5 yr after planting. Bare-rooted Douglas fir remained significantly larger
than plugs, but relative growth rates for the initially smaller plugs were significantly greater for
diameter and volume. Survival and growth of ponderosa pine tended to be better than those of
Douglas fir. It was concluded that both species appeared to be suitable for reforestation after clear
felling on sites subject to drought.
261. Henry, C.L. 1987. Growth response, mortality, and foliar nitrogen concentrations of four tree
species treated with pulp and paper and municipal sludges. In The-forest-alternative-for-