COST OF USING POWER ON WHEAT FARMS IN OREGON 29 
WORK DONE PER DAY WITH HORSES AND. WITH TRACTORS 
On these farms 10 hours of work with the tractor accomplished 
nearly two and one-half times the amount of plowing done with 
horses. (Table 25.) For other operations, such as harrowing, 
disking, weeding, and drilling, the tractor farmers did from two to 
three times as much work in 10 hours as did those who used horses. 
On some farms where horses alone were used for motive power, 
this difference was not so great because of the use of large teams and 
machines. Large units of power are useful at rush periods, per- 
mitting a maximum amount of work to be done with a minimum of 
man labor, and at the proper time. 
WORK DONE PER IO-HOUR DAY, WITH TRACTOR AND WITH HORSES 
ACRES 
0 10 20 30 5Ou 005 G0 70 80 390 
PLOWING _-__ 111A 
B ] 
HARROWING, SPIKE TOOTH - epaulets 
| = 
HARROWING, SPRING TOOTH Uatetstttttae Ei | 
! | 
DISKING BEFORE PLOWING-- QQ | / 
— 
OTHER DISKING—-———————— Citi | : | 
| 
erence ULL 
l | 
DRILLING---------------- MLLLLMULULLLLLAs See | 
| 
CUTTING AND THRESHING__ MYX, | | 
WITH COMBINE eet oaks eee 
Z/, Horse work he? Tractor work 
Fig. 9.—The work accomplished per 10-hour day for all operations was very much 
greater where tractors were used 
As these farms were handled during the years of the survey, the 
use of tractors resulted in a saving of man labor in the performance 
of the various field operations amounting to from 0.1 to 0.6 hours 
per acre. The work accomplished per 10-hour day with tractors and 
with horses is shown graphically in Figure 9. 
TABLE 25.—Work done per 10-hour day with tractor and with horses, horse- 
equivalent of tractor work, and saving in man labor 
Work done per | Horse- | Saving 
10-hour day with— | equiva- | ,i2 ™an 
i “- |labor per 
Operation lentioh a) h 
tractor ier ih 
Tractor | Horses work Factor 
See ae fie ry 
: Acres Acres Number | Hours 
LE} ORG AEA ee Ss is, ee a Take See sn ee elie ale eee malar AS 18.0 7.6 21.6 0.6 
Harrowing: 
BDIKG LOO oa S52 ee tk AN oe 85. 7 43.9 13.8 i 
DEC COOL Ease ee RIES ASS BA EI 45.6 18.7 14.5 3 
Diskines beforesplowing sess essa Es Sp 22 56. 5 20. 2 33. 3 -3 
DIMER GIS kano mmeg Pee ea ie en ee eee 40.5 17.4 16.0 2 
Wieed ing. Fee ere eri tea tats bth gop pili tiegiiy erste 3 72.3 24.0 18.8 .3 
BBY elias ee Se ee hg 72.4 22. 5 16.7 ot 
Cutting and threshing with combine! 1)... 32.8 L764 24. 6 | .4 
1 By horse-equivalent of tractor work is meant the number of horses that would be required to do the 
same amount of work as was done by the tractor. 
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