. Shingle tow packing material for conifer seedlings. Conifers Packing; Conifers Seedlings. widely depending on field conditions and the judgment of people in charge. Nurserymen estimate that 100 bales of shingle tow will pack 1 million trees of the size used in these tests. At 25 bales per ton, a thujaplicin content of 120 p. p. m. , and 50 percent extraction, an average of 0. 2 mg. thujaplicins per seedling might be available for uptake. The actual amount available to an individual seedling could be much higher or lower if the starting concentration were different or if moisture distribution
. Shingle tow packing material for conifer seedlings. Conifers Packing; Conifers Seedlings. widely depending on field conditions and the judgment of people in charge. Nurserymen estimate that 100 bales of shingle tow will pack 1 million trees of the size used in these tests. At 25 bales per ton, a thujaplicin content of 120 p. p. m. , and 50 percent extraction, an average of 0. 2 mg. thujaplicins per seedling might be available for uptake. The actual amount available to an individual seedling could be much higher or lower if the starting concentration were different or if moisture distribution were uneven in the packed bundle. DISCUSSION Shingle tow is a potentially toxic agent-- chemicals naturally present in cedar wood may kill or injure nursery seedlings. However, even when sub- stantial amounts of toxic compounds remain in inadequately leached shingle tow, conditions favoring low uptake of these compounds or their adsorption by soil could protect seedlings packed within the tow. Field performance trials would reveal shingle tow's total effect on seedling survival and growth, but 7. 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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Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
