COST AND UTILIZATION OF POWER ON FARMS. 
59 
Table 47. — Relation of number of horses disposed of to size of farm and to crop acres 
per horse. 
Number 
of farms. 
Crop 
acres per 
farm. 
Crop acres per 
horse. 
Number of horses disposed of. 
Before 
purchase 
of tractor. 
After 
purchase 
of tractor. 

44 
21 
41 
24 
19 
23 
205.9 
155.5 
178.3 
178.5 
187.6 
209.6 
23.4 
23.2 
22.1 
20.3 
21.4 
18.3 
23.4 
1 
27.2 
2 
29.4 
3 
' 30.8 
4 
39.2 
37.4 
All ... 
172 
187.8 
21.5 
29.0 
Some Of the men who did not dispose of any workstock had owned 
only 3 or 4 head and probably needed all of them for some one oper- 
ation even with a tractor on the place (see Table 26) . This was not 
true of nearly all of the 44, however. The table shows that they 
had not been keeping appreciably fewer workstock in proportion to 
the size of their farms than had most of the men who reduced their 
workstock after the purchase of tractors; and that the number of 
crop acres per horse at the time of the investigation was less than on 
the other farms. 
INCREASE IN INVESTMENT DUE TO PURCHASE OF TRACTORS. 
Table 48 shows the net increase in investment due to the purchase 
of tractors. 
The costs of the tractors and of the implements purchased for use 
with them are given on page 46. The owners of both the 2-plow 
and the 3-plow tractors who did not change the size of their farms 
disposed of 2.2 head of workstock on the average. The acres per 
horse before and after the purchase of tractors on these farms were 
practically the same as on the farms which were changed in size, and 
on account of this fact it seems fair to assume that the men who 
changed the size of their farms would have been keeping 2.2 more 
head of workstock if they had not owned tractors. The average 
value per head of the workstock on the farms was $144, and while 
the value of the workstock which was disposed of was not obtained 
in detail, an investigation made in the Corn Belt in 1918 (see Farmers' 
Bulletin 1093) showed that after the purchase of tractors "it was 
not the poorest horses which were sold but those of about average 
kquality." 
