To determine the effects of rate of nitrogen application and storage time on fruit quality of highbush blueberries (Vaccinium corymbosum, L.), five rates of ammonium sulfate fertilizer were soil-applied in 1984 and 1985 to cvs. Bluecrop and Jersey. Fruit was harvested up to three times during the 1985 season and...
Increasing demand for exploitation of natural resources
in federal-municipal watersheds in the Western United
States has caused conflicts involving municipalities, the
U.S. Forest Service, and community interest groups. Better
understanding of the resource management process is needed
to help resolve these conflicts.
The objectives of this study were to document...
This study was initiated to make some preliminary
evaluations of the effects of red alder (Alnus rubra,
Bong.) leaf fall on stream water quality, particularly
water color. Laboratory tests were also conducted
to better understand the effects of leaf loading, duration
of leaf leaching, and type of leaching on
changes...
Three hundred fifty families from 11 breeding zones in southwest Oregon were grown in a common garden in Corvallis, Oregon, and patterns of genetic variation for seed weight and six first-year seedling characteristics were described. For most characteristics, large differences among breeding zones were found along an east-west
transect, with...
A branch mortality dating technique and whorl
sampling strategy were implemented to model five-year
crown recession from data collected on temporary
plots. Twenty-eight Douglas-fir from two levels-of-growing-
stock studies in Oregon and Washington were
first dissected to validate the proposed dating
technique and assess alternative sampling strategies.
Branch mortalities in...
Forest tree nurseries in Mexico produce millions of seedlings per year. This is accomplished with high financial investment and unsatisfactory quality control of
seedlings. Drought is a major stress factor in Mexico. Thus, planting drought tolerant pine seedlings on dry sites will result in better survival and growth of seedlings....
First season container-grown noble fir (Abies procera) and Shasta red fir (Abies magnifica var. shastensis) seedlings were given six combinations of shade (0%, 30%, and 50% shade) and irrigation (moist and dry) treatments in the nursery beginning in late July, 1977. To evaluate frost hardiness
development, destructive freezing tests were...
Jeffrey pine occurs in the mountains of California and adjacent states. In the Klamath Mountains, the northern margin of the range, it is restricted to infertile ultramafic soils, forming very open stands of low density. It occurs predominantly on more fertile soils in the Sierra Nevada and southern portions of...
Two-year-old Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] seedlings of two seed sources raised in three nurseries in Oregon and Washington were tested for differences in frost hardiness from September 1985 to March 1986. The objective of the study was to determine whether nursery location had an influence on seedling acclimation, deacclimation...
Ungerminated seed and recent germinants from 39 open-pollinated Douglas-fir (Pseudotsuga menziesii var. menziesii (Mirb.) Franco)
families were planted in each of three competitive environments in order to determine the degree to which growth differences among families are influenced by competitive environment, seed weight, and
date of emergence. The three competitive...