58 
BULLETIN 99T, U. S. DEPARTMENT OE AGRICULTURE. 
Farms where acreage was not changed. — The average size of the 172 
farms where the acreage was the same as before the purchase of trac- 
tors was 244.5 acres, and the number of crop acres was 187.8. Those 
who increased the size of their farms after the purchase of tractors, 
had in general been farming somewhat smaller acreages than these 
men. The men who had not changed their acreage had kept on the 
average, 8.7 head of works tock before the purchase of tractors — one 
head for each 28.0 acres, and one for each 21.5 crop acres. At the 
time of the investigation they had 6.5 head — one for each 37.7 acres 
and one for each 29.0 crop acres. 
The size of the tractor evidently had no influence on the reduction 
in workstock. One hundred and seven of the 172 men who did not 
change their acreage owned 2-plow, and 61 owned 3-plow machines. 
Before the purchase of tractors, the owners of each size kept one 
horse for each 21.7 crop acres. At the time of the investigation the 
owners of the 2-plow machines had one head for each 28.8 crop acres, 
and the owners of the 3-plow machines one for each 29.6 crop acres. 
On the average, the owners of each size reduced their workstock by 
2.2 head. 
Every farmer was keeping at least two head of workstock in addi- 
tion to his tractor, and no one who did not increase his acreage owned 
less than three head before the purchase of his tractor. 
Table 46 shows the actual number owned before the purchase of the 
tractors and the number disposed of by the 172 men. 
Table 46. — Changes in number of uorkstock after purchase of tractor made by 172 owners 
whose acreage remained the same. 
Number of work- 
stock before pur- 
chase of tractors. 
Num- 
ber of 
owners. 
Number of owners who disposed of— 
None. 
1 head. 
2 head. 
3 head. 
4 head. 5 head. 
6 head. 
7 head. 
9 head. 
3 or 4 
7 
38 
44 
41 
30 
12 
4 
11 
10 
8 
4 
7 
2 
8 
9 
1 
1 
1 
11 
13 
13 
2 
1 
4 
6 
8 
6 
4 
5 
5 
5 
7 or 8 
1 
2 
7 
9 or 10 
4 
4 
11 or 12 
1 
3 
More than 12. . 
1 
Total 
172 
44 
21 
41 
24 
19 
1 
The organization of the farm must be known in detail before one 
can say definitely how many head of workstock a farmer should keep 
for the greatest profit after he purchases a tractor, but it is apparent 
that some of these men were still keeping more workstock than 
needed. (See page 37.) Table 47 shows the average number of 
crop acres, and the number per horse before and after the purchase 
of tractors on the farms where different numbers of workstock were 
disposed of. 
