TRACTORS AND HORSES IN THE WINTER WHEAT BELT. ao 
Motor trucks were used for part of the road hauling on these farms, 
82 of the 354 farmers having made some use of trucks, either hired or 
owned, during the year. The horse-labor equivalent of the motor 
truck hauling and the percentage of the total road hauling done with 
them are also shown in Table 25. 
For the average farm the equivalent of 6,670 hours of horse labor— 
19 hours per crop acre—was used for drawbar work during the year. 
The intensity of tillage, however, was different in the three areas. 
In the southern area the equivalent of 26 hours of horse labor per 
crop acre was used; in the western area, 15 hours; and in the northern 
area, 19 hours. These figures are practically the same in every case 
as the averages of the actual number of hours of horse labor per crop 
acre on the farms where tractors were not owned. (See Table 61.) 
Table 26 and Figure 12 show the total amount of power used per 
farm for both drawbar and belt work (with the exception of that 
done with engines of 4-horse power or less), and the proportion 
furnished by horses, farm tractors, and other engines and motor 
Horsepower Hours 
Area 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 
SouTHERN. eS VILLLLLLILILLLLLLPALALL LAL LA 
WESTERN_. TIPTIASIADEAETE DIESE EME EEE EG. $$ — Bi 
NORTHERN... 
PILI LLL LLL LLL LL LLL 
(G5) wep Horses wzaTracfrors Gs0/her Engines C7 Moror Trucks 
Fig. 12.—Proportion of power furnished by horses, farm tractors, other engines, and motor trucks. 
trucks. The figures for the total amount of power used and the pro- 
portions furnished by the different sources of power are based on the 
assumption that 1 horse hour of drawbar work is the equivalent of 
1 horsepower hour of belt work. While there are wide variations in 
the proportion of the available power actually utilized both on draw- 
bar work and on belt work, these figures give the best available 
approximation of the total amount of power used for all work on 
these farms. 
TABLE 26.—Total power per farm for drawbar and belt work in different areas. 
{Based on the assumption that 1 horse hour of drawbar work is equivalent to 1 horsepower hour of belt 
work.| 
r 
ialien Per cent | | 
equiva | Horse cent_| power | Pet cent | oftotal | of total 
ent o power | (drawbar | es power | power 
Area power hours for | Total. for belt | and belt) | , POW® || furnished) furnished 
for ted work is furnished {Utmished by other | by motor 
qiwbee ; of total.) A by |PY S€S-| engines. | trucks. 
work. ractor. 
ui | | z - 
OMG HOM = eso. ak 6, 812 2,021 | 8, 833 | 23 41 42 16 1 
Miestpmgs fii fe 7, 483 1,894 | 9377 | 20 42 41 | 15 2 
ruHerne ety ee sa 5, 930 1,934 | 7,864 25 | 31 | 54 14 1 
Total and average. .| 6,670 1,953 | 8,623 23 38 46 15 1 
60589° —24—_4 
