ThaiScience
ThaiScience
ENGINEERING JOURNAL CHIANG MAI UNIVERSITY
Volume 25, No. 02, Month AUGUST, Year 2018, Pages 135 - 141
Influence of rubber clone, log diameter, and labor skill on yield of rubberwood lumber
Peerapong Chukeaw, Somchai Chuchom and Thanate Ratanawilai
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Yield of rubberwood lumber is depended on many factors including rubber clone, log diameter, and labor skill. To find the relationship among these factors on the production yield, experimental design was established with 4 levels of rubber clone (RRIM 600, GT 1, PB 235, and PR 255), 4 levels of log diameter (5-7 inches, 8-10 inches, over 10 inches, and mixed size), and 2 levels of labor skill (general labor skill and expert labor skill). The results showed that all 3 factors significantly affect the yield of rubberwood sawn at 95% confidence level. A mathematical equation to predict the yield was constructed as follows; Y = X1[(5.4695X2+(6.4657X3) +(7.2562X4)+(4.6511X5)] whereas Y is quantity of products lumber grade AB, X1 is logs quantity, X2, X3, X4, and X5 are %quantity of rubberwood clone; RRIM 600, GT 1, PB 235 and PR 255, respectively. Root mean square error is 28.2 which is reasonable to be accepted.
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Published by : Faculty of Engineering Chiang Mai University
Contributions welcome at : http://researchs.eng.cmu.ac.th/?name=journal
