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20 horsepower 75 percent acreage acres per farm adjusted to 1961 age of tractors Agricultural Economics Students Agricultural Experiment Station average age Average number Average tractor COST OF OPERATING Cost per acre cost per hour crop acres DB H.P. diesel fuel dollars drawbar horsepower eastern and southcentral estimates farm in eastern Farms Gallons Farms Farms reporting ﬁeld ﬁxed cost Gallons Farms Gallons gasoline horsepower or less horsepower per farm hour reporting hour to operate hours of annual included labor costs large tractors machinery machines medium and large Nebraska Agricultural Experiment Nebraska farms Number I Percent number of hours number of tractors one-ﬁfth OPERATING TRACTORS Percent Number percent of pull Power and labor Price paid pull at maximum purchase price Rated at 75 reporting per hour rptg shelter small tractors southcentral Nebraska southwestern Nebraska tillage Tractor fuel Tractor hours Tractor Tests tractors per farm tractors studied University of Nebraska