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1 Purpose and scope

1.1 These data include representative values of farm machinery operation parameters as an aid to managers, planners, and designers in estimating the performance of field machines.

1.2 These data are intended for use with ASAE EP496. Some data are reported in equation form to permit use in computer and calculator mathematical models.

1.3 These data report typical values for tractor performance, implement power requirements, repair and maintenance costs, depreciation, fuel and oil use, reliability for field operation, probable working days, and timeliness coefficients as measured by experiment, modeling, or survey.

1.4 Where possible, variation in sampled data is reported using the range, a standard deviation, SD, or a coefficient of variation, CV, defined as SD/mean. In a normal distribution 68% of the population should be contained in a range of ±1 SD about the mean, and 95% will be contained in a ±2 SD.