Determination of Optimum Life (Economic Life) for Mf285 Tractor:A Case Study in Center Region of Iran

摘要

Making use of tractor to do agricultural mechanized operations is responsible for a fundamental and important role to mechanize agricultural section. Replacement of farm machinery with a new similar machine is one of the most important objects of farmmachinery management. Decision making about replacement of used farm equipment with a new similar one is one of the important items in farm machinery management. Proper performance in this case can lead to timely, high quality farm operations which in turns results in considerable decrease in product expenditures and also more income. Based on that the study in order to determine optimum life or economic life for MF285 in west region of Isfahan province was performed. Listed price of tractor, annual depreciation and Internal Rate of Return (I.R.R) in the study period were calculated. These items accompanied by their repair and maintenance cost were used to determine their economic life. Finally replacement time for the study tractor 18316 hours was predicted.