Planting techniques, size and age of seedlings, and protection
against animals were investigated for their influence on survival of
ponderosa pine at two sites in southern Oregon. Caging and mulching
with paper were the most effective measures for reducing mortality.
Preliminary trials prior to large-scale planting were recommended for
determining...
Germination and survival of Douglas-fir on seedbeds of unburned,
lightly burned, and severely burned soil, charcoal, litter, and sawdust,
exposed to 100, 75, and 25 percent of full light, were studied on a
south-facing clearcutting in the Coast range of Oregon.
Irrespective of exposure to light, germination was best on...
Survival and growth during three years at 8 out-planting areas are reported for Douglas-fir from 14 sources of seed. Early survival was highest near Nimpkish on Vancouver Island. At most plantations, trees from the local seed source grew as well as did those from the best three sources. Trees from...