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Abstract Hunt (1983) mentioned that machiney costs have a great influence on profit. For farmers who don’t have control over product prices, the revenue is well fixed, then, the size of an operation can be limited by machinery costs. Machinery costs are divided into two main categories, fixed costs and variable costs. Fixed costs are independent of use and it is depending more on how long a machine is owned rather than how much it is used. Fixed costs are including the following items: a - Depreciation c- shelter e- Interest b- Taxes d - Insurance Variable costs are those varying in proportion to the amount of machine use. It is including the following items : a - Fuel and lubricant b - Labor c - Repair and maintenance Repair and maintenance costs are considered as an important part of machinery costs. That costs involve those expenditures necessary to restore or to maintain the technical soundness and reliability of the machine following wear and tear, random failure, and accidents. There are many factors affecting rerpair and maintenance costs of farm machinery such as hours of working, machine age (years), made and model, and farm size. Bainer et al. |