22 



EXPERIMENT STATION BULLETIN 



used less and 16 more than this. The five highest used over five times 

 as much man labor as the five lowest. When calculated according to 

 actual yields, the average use of machines and man labor per bushel was 

 less but the differences were more extreme. 



GAL LONS PER MAN HOUR 

 140 



120 



100 



80 



60 



40 



20 



SMALL MEDIUM LARGE 



Figure 15. — Average total gallons of spray used per man hour 

 by small, medium, and large machines 



Since spraying is the chief operation prior to harvest time in this 

 competitive commercial business, the variation in efficiency as indicated 

 above are indeed very wide. For instance, one outfit actually applied 

 more than seven times as much spray per hour as the lowest. Commer- 



M ACHINE HOURS | ~" 



.7 

 .6 

 .5 

 .4 



.3 

 .2 



LARGE 



MEDIUM 



SMALL 



Figure 16. — Average season machine hours per mature tree equivalent 

 by large, medium, and small machines 



