COST AND UTILIZATION OF POWER ON FARMS. 
17 
Table 13 shows the number of owners of 2 and 3 plow tractors who 
used their machines on the different operations: 
Table 13. — Number of owners using their tractors on the different operations. 
Operation. 
Plowing (spring or fall) 
Pulling disks alone 
Pulling disks in combination with harrows, rollers, or plankers . . 
Pulling harrows, rollers, etc., alone 
Drawing hay loaders 
Drawing grain binders 
Other draw-bar work on home farm 
Owners using 2- 
plow tractors for 
operation specified. 
Xvrnber. ; Per cent. 
All 
95 
101 
53 
24 
101 
62 
100 
55 
58 
30 
It 
58 
36 
Owners using 3- 
plow tractors for 
operation specified. 
Number. 
All 
46 
64 
7 
13 
27 
16 
Per cent. 
100 
44 
62 
. 7 
12 
26 
15 
Fig. 5. — Tractors did 85 per cent of all the plowing on these farms. 
Plowing. — Table 14 shows the average number of acres plowed 
during the year, and the number plowed with tractors and with horses 
in both the spring and fall on farms of different sizes. A little over 
half of the crop area of the farms was plowed during the year. 
Eighty-five per cent of all this plowing was done with the tractors; 
81 per cent of the spring plowing was done with them, and 91 per 
cent of the fall plowing. Every man interviewed had used his 
tractor for some plowing during the year, and 140 of the 286 had 
done all of their plowing with tractors. (See fig. 5.) 
56390°— 21— Bull. 997 3 
