12 
BULLETIN 1348, U. S. DEPARTMENT OF AGRICULTTIBE 
worker and 730 per farm in Alabama, to as liigh as 4,580 per worker 
in North Dakota and 10,000 per farm in California. 
Farm-management studies and the various surve3^s made indicate 
that the average agricultural ^^orker is employed in productive labor 
Fig. 10.— Average primary horsepower per farm worker 
approximately 3,000 hours annually. From this it will be seen that, 
in the United States as a whole, approximately 1 horsepower-hour 
of power is utilized for each 2 hours of human labor. Tliis amount 
Fig. 11.— Estimated distribution of horsepower-hours of power utilized annually on farms. Each 
dot represents 3,000,000 horseppwer-hours 
varies, however, from an average as low as one-eighth horsepower- 
hour of power per hour of human labor in Alabama, to as high as 
IJ^ horsepower-hours per hour of labor in North Dakota. Figure 
I 
