Productivity and cost of farm tractor skidding
2012
Gilanipoor, N., Tarbiat Modares Univ., Tehran (Iran Islamic Republic) | Najafi, A., Tarbiat Modares Univ., Tehran (Iran Islamic Republic) | Heshmat Alvaezin, S.M., Tarbiat Modares Univ., Tehran (Iran Islamic Republic)
In this study, productivity rate and operation cost of farm tractor were evaluated in a mountainous natural forest. Data for the study came from a detailed time study in the Research and Educational Forest of Tarbiat Modares University (Iran) and was used to develop a multiple linear regression model to predict the skidding cycle time. The results showed that effective independent variables of skidding time were skidding distance and slope of skid trail (P = 0.01). Average productivity rate ranged from 2.43 to 2.60 square m/h. The total cost of the system was 10.24 USD/h whereas 4.58% of the cost of skidding resulted from personal delay. The cost and productivity resulting from this study emphasized the importance for foresters to consider a farm tractor when designing skidding operations in young stands or prescribing a combination of two machines in mature stands.
显示更多 [+] 显示较少 [-]