KNOTLESS PINE TREES
Russian foresters have discovered and successfully carried out a method of growing pine trees completely free from knots. The tree is allowed to develop a bushy growth near the ground until it is eight years old. After this all branches appearing above this are pinched out until it is tall enough to supply a good-sized log. A bushy top is then allowed to grow while the tree fills out. It is claimed that by this method it is possible to obtain logs of knotless wood as long as twenty feet.
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https://paperspast.natlib.govt.nz/newspapers/BPB19460729.2.36
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Bay of Plenty Beacon, Volume 10, Issue 4, 29 July 1946, Page 7
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93KNOTLESS PINE TREES Bay of Plenty Beacon, Volume 10, Issue 4, 29 July 1946, Page 7
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