Calculation of E-Moduli of Beams under Third- or Centre-Point Loading: Program for HP-25 Calculator |
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| Authors: | W J van Wyk J Myburgh |
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| Institution: | 1. Department of Wood Science , University of Stellenbosch;2. Sappi Fine Papers (Pty.) Ltd. , Stanger Mill |
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| Abstract: | A method for precision sowing Eucalyptus seeds was needed at the Florida Division of Forestry's nursery. A way to do this is to coat cleaned seeds to form uniform pellets, which are easy to handle with mechanical equipment. The small volume of the seed lots to be pelleted in Florida restricted choice of commercial companies that could do the pelleting. Small volumes (50 to 125 ml) of Eucalyptus robusta Sm. seeds were successfully pelleted in-house with a coating of fine silica sand filler and two polyvinyl alcohol (P.V.A.) binders, and by two commercial companies—Germain's, Inc. and Hilleshog Seed Co., Ltd. Nursery performance of sand-P.V.A. and Hilleshog pellets was similar to that of uncoated seeds, although germination speed was slowed. The binder Gelvatol®,1 a coldwater soluble P.V.A., had advantages over Elvanol®, a cold-water insoluble binder. Plant yield of Germain's Filcoat® pellets was appreciably less than that of uncoated seeds, but the toughness of the Filcoat® pellets might be an advantage in some sowing situations. The Florida Division of Forestry routinely pellets seeds of several Eucalyptus species in a reciprocating-rotating pan using fine sand and Gelvatol®. |
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| Keywords: | FOREST INDUSTRY HISTORY 2003 TO 2006 |
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