. Shingle tow packing material for conifer seedlings. Conifers Packing; Conifers Seedlings. remove mg. B-thujaplicin from the solution (fig. 3). Thujaplicin adsorbed on the soil could not be re-extracted with ferric acetate, indicating that the forces involved are strong. i 1. 0 20 40 60 80 100 WEIGHT OF SOIL ADDED ( mg ) Figure of B-thujaplicin remaining in solution after adding various amounts of nursery soi I. To test whether seedlings with unwashed roots would be protected by ad- hering soil, roots of dormant 2-0 seedlings from the Wind River Nursery were immersed from 6
. Shingle tow packing material for conifer seedlings. Conifers Packing; Conifers Seedlings. remove mg. B-thujaplicin from the solution (fig. 3). Thujaplicin adsorbed on the soil could not be re-extracted with ferric acetate, indicating that the forces involved are strong. i 1. 0 20 40 60 80 100 WEIGHT OF SOIL ADDED ( mg ) Figure of B-thujaplicin remaining in solution after adding various amounts of nursery soi I. To test whether seedlings with unwashed roots would be protected by ad- hering soil, roots of dormant 2-0 seedlings from the Wind River Nursery were immersed from 6 to 96 hours in solutions containing 2. 6 mg. of B-thujaplicin per seedling. All 180 seedlings tested, including controls, survived. Thujaplicins Available from Shingle Tow Stored at Nurseries Shingle tow from four different nurseries was analyzed for thujaplicin content; for seven samples it ranged from 0 to 120 p. p. m. All samples ob- tained from nurseries using supplemental sprinkling were low in thujaplicins, though the number of samples checked was too small to justify firm conclusions on its effectiveness. Several factors, which are difficult to estimate in quantitative terms, regulate the amount of thujaplicins actually available for uptake by a seedling. Quantity of thujaplicins reaching solution may be only part of the total content present in shingle tow, since water used in packing and planting seedlings is cold, which reduces its extractive ability (fig. 4). The amount of water in shingle tow may vary, and the amount subsequently added varies even more 6. 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 Krueger, Kenneth W. (Kenneth William), 1935-. Portland, Or. : Pacific Northwest Forest and Range Experiment Station, U. S. Dept. of Agriculture
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