TRACTORS AND HORSES IN THE WINTER WHEAT BELT. 9 
Table 11 and Figure 2 show the number of hours tractors were 
used for different kinds of work on farms of different sizes in the 
three areas. 
SOUTHERN AREA 
Hours of Work 
Size of Farm 
(Crop Acres) 
160-239...-- YZZZZZ73 
400-479....- 
480 andover 
Less than 160 
160-239_.__- 
240-319-2.2- 
320-399_... 
ee 
ALL AREAS 
354 Fars 22772 | | | | 
(Bs | gum Drawhar Work = —BeltWork wz Custom Work 
Fic. 2.—Hours of tractor work per year on farms of different sizes. 
There was a larger percentage of small machines on the smaller 
farms than on the larger ones and to this extent the number of hours 
of work per year is not a true index of the amount of work done by 
the tractors on the farms of different sizes. The table shows, how- 
ever, the relative importance of the different classes of work. : 
The work done annually by an individual tractor depends upon the 
particular field operations for which it is used, the amount of belt 
and custom work done, and to a certain extent upon the amount 
of time it is out of running order when needed, as well as upon the 
size of the farm. The variation in the number of hours work done 
during the year by the 354 tractors is shown in Figure 3. 
The number of hours the different sizes of tractors were used for dif- 
ferent classes of work is shown in Table 12. The two-plow machines 
did considerably less belt and custom work in each area than did the 
larger sizes. For all areas, 88 per cent of the work done by the two- 
plow machines was drawbar work on the home farm, and only 26 
machines, 29 per cent of the total number, did any belt work what- 
ever. Most of the belt work on these farms is threshing, and the 
small tractors are not powerful enough to drive most of the threshing 
machines used. (See p. 15.) 
60589 ° —24——_2 
