COST AND UTILIZATION OF POWER ON FARMS. 
55 
drawbar work on the home farm constituted 80 per cent of the total 
work done by the 2-plow machines, 71 per cent of that done by the 
3-plow machines, and 76 per cent of that done by all tractors. Con- 
sequently the figures represent approximately these percentages of 
the total cost of operating the tractors. 
Table 43. — Total annual cost of tractors for drawbar work on home farm. 
[Averages.] 
2-plow tractors. 
3-plow tractors. 
A]l tractors. 
Operation. 
Days 
work 
per 
year. 
Cost 
per 
day. 
Cost 
per 
year. 
Days 
work 
per 
year. 
Cost 
per 
day. 
Cost 
per 
year. 
Days 
work 
per 
year. 
Cost 
per 
day. 
Cost 
per 
year. 
7.9 
5.1 
4.0 
3.4 
1.1 
.4 
1.9 
2.0 
$12. 78 
12.86 
13.35 
12.55 
11.97 
10.02 
11.60 
1 12. 50 
$100. 96 
65.59 
53.40 
42.67 
13.17 
4.01 
22.04 
25.00 
6.3 
5.2 
2.3 
4.0 
.2 
.4 
.9 
.9 
$18. 07 
18.69 
17.13 
16.82 
19.14 
14.18 
16.45 
i 18. 00 
$113. 84 
97.19 
39.40 
67.28 
3.83 
5.67 
14.81 
16.20 
7.3 
5.1 
3.4 
3.5 
.7 
.4 
1.5 
1.6 
$14. 85 
15.23 
14.59 
14.29 
12.04 
11.57 
12.61 
1 14. 50 
$108. 40 
77.67 
49.61 
Disking in combination 
50. 02 
8.43 
4.63 
Drawing grain binder 
Other work 
18.92 
23.20 
Total 
25.8 
$326. 84 
20.2 
$358. 22 
23.5 
$340. 88 
J Approximate. 
Size of Farm 
(Crop Acres) 
500 
D 
1000 
ollar 
15 
s 
00 
2000 
2500 
Less than 80. 
80 - 1 1 9 
120 " 159 
> 
Horses h 
Tract ors_.-jon 
™— 
160 - 199 
200 ~ 239 
240 -279_„„ 
280 - 3 i 9 
320 and over.. 
All 
L_ 
I — ' 
Fig. 14.— Cost of power for drawbar work on farms of different sizes (1920). 
The cost of the power for drawbar work furnished by the average 
tractor was equal to the cost of keeping 2.1 head of workstock. The 
cost of keeping horses has declined considerably more than the cost 
of operating tractors since the investigation was made (see page 54) 
and based on present prices (Sept., 1921) the cost of the power fur- 
nished by the tractors would be equal to the cost of keeping 3.3 head 
of workstock. 
The cost of keeping the workstock on the average farm during the 
year of the investigation was $1,076. Thus the total cost of power, 
both horse and tractor, for drawbar work was $1,417. Seventy-six 
per cent of this total was chargeable to the workstock and 24 per 
cent to the tractor. 
The cost of power, both horse and tractor, for drawbar work on 
farms of different sizes is shown in Table 44, and in figure 14. 
