. Germination and early growth of coastal tree species on organic seed beds. Germination; Trees Growth. Figure 2. —Uprooted hemlock seedling with roots embedded in buried rotten wood. LABORATORY EXPERIMENTS Methods To test organic seed beds under controlled conditions, rotten Douglas-fir wood and hemlock duff were collected on the Cascade Head Experimental Forest. Each material was air-dried, screened through 8-millimeter mesh, blended to insure uniformity, and chemically analyzed. Clay pots were filled with weighed quantities of the seed bed materials, then immersed in water to the pot collar
. Germination and early growth of coastal tree species on organic seed beds. Germination; Trees Growth. Figure 2. —Uprooted hemlock seedling with roots embedded in buried rotten wood. LABORATORY EXPERIMENTS Methods To test organic seed beds under controlled conditions, rotten Douglas-fir wood and hemlock duff were collected on the Cascade Head Experimental Forest. Each material was air-dried, screened through 8-millimeter mesh, blended to insure uniformity, and chemically analyzed. Clay pots were filled with weighed quantities of the seed bed materials, then immersed in water to the pot collars. After both rotten wood and duff seed beds were saturated, equal numbers of seeds (all of the same species) were placed on the seed bed surface in each pot (fig. 3). Douglas-fir, Sitka spruce, lodgepole pine, western hemlock, western redcedar, Pacific silver fir, and red alder seeds from low-elevation coast sources were used. Each seed bed-species combination was replicated five times. All pots were covered with polyethylene to prevent drying of seeds. They were then placed in a growth chamber set for 1 6-hour, 20° C. days and 8-hour, 8° C. nights. A combination of incandescent, cool white, and warm white fluorescent lamps provided 1, 500 foot-candles of light at the seed bed Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Minore, Don. Portland, Or. : Pacific Northwest Forest and Range Experiment Station, Forest Service, U. S. Dept. of Agriculture
Size: 1544px × 1618px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectgermination
