36 
BULLETIN 997, U. S. DEPARTMENT OF AGRICULTURE. 
Table 24. — Proportion of different operations done with horses and with tractors (all 
farms). 
Operation. 
Days of 
horse 
labor per 
farm. 
Horse- 
day equi- 
valent of 
tractor 
work. 
Total. 
Percent- 
age done 
with 
tractors. 
Plowing 
18.9 
34.5 
11.8 
12.2 
80.4 
17.4 
10.7 
3L3 
99.0 
4.4 
43.8 
49.1 
36.4 
109.2 
68.4 
128.1 
102.9 
11.8 
12.2 
80.4 
18.9 
18.1 
31.3 
99.0 
12.3 
43.8 
49.1 
36.4 
85 2 
Fitting ground after plowing 
66 5 
Seeding grain 
Planting corn 
Cultivating 
Haying 
1.5 
7.4 
7 9 
Cutting grain. .. 
40 9 
Thrashing 
Corn harvest : 
Other fieldwork 
7.9 
Hauling manure 
Other work on farm 
Road hauling 
Total 
449.9 
194.4 
644.3 
30.1 
As measured in terms of the days of horse labor required for it, 
the tractors did 30.1 per cent of the drawbar work on these farms. 
The proportion of the work done with the tractors varied among 
the individual farms, but there was no great variation in the average 
for the different areas. 
The percentage of the work, in terms of days of horse labor, done 
by the tractors in the different areas was as follows: 
Percent. 
Madison County, Ohio 27. 
Seneca County, Ohio 30. 2 
Madison County, Ind 35. 6 
Montgomery County, Ind 34. 
Livingston County, 111 30. 5 
Knox County, 111 28. 9 
The tractors on the larger farms did considerably more drawbar- 
work than the machines on the smaller farms, but the size of the 
farm had very little influence on the proportion of the total done 
with the tractor. 
If it had been possible to measure the work done by the tractor 
and workstock in terms of drawbar pull and distance traveled, the 
proportion of the total done by the tractors would have been con- 
siderably greater. A large proportion of the work done by the 
tractors was plowing and other work in preparing the seed bed, 
which requires steady pulling of a heavy load, while a large part of 
the work done by the horses was hauling and other work which does 
not require steady pulling of heavy loads. 
The 2-plow tractors were used more for disking and for the lighter 
operations of harrowing, rolling, etc., and for cutting grain than 
were the 3-plow machines (see Table 12). The proportion of the 
total work required for plowing and preparing the seed bed and for 
