TRACTORS AND HORSES IN THE WINTER WHEAT BELT. 23 
divided by 482). In the southern area the average tractor did as 
much work as 6.4 head of work stock; in the western area 8.8, and in 
the northern area 2.9. 
TaBLeE 24.—AHorse labor equivalent of tractor work. 
Horse hours per farm. 
Operation. 
Southern | Western | Northern All 
area. area. area. farms. 
= UIE TET a re ee a ee 36 256 5d 102 
ESA iayenTipewee ee = 8 Lo, een =. 3 Sb occ innce se ee NR 1,116 1,212 1,011 1,098 
_ SADE: . ob 3545505 Se ee ee 196 2A eee oe 73 
igicnlowine-and listing =: =... -Sssec..- os. cb.cesdt- 222 1, 348 1, 492 1, 066 1,273 
Makan Pe lOWeULOMOUNG «2.82 coe te oc ce eissie soles l-t se oeee tees 339 | 11 14 124 
Disking unplowed ground......... Se tee ON or 108 | 688 66 268 
asa eT COMMOINALLOD . 3.) 25222202252 hee aces - een So toed scenes 232 90 | 8 108 
JE TanD a. . SS a 254 | 6 45 94 
Sledding........ eos Ca ee Se ee ee ee eee 72 Sil eee ea oe 28 
Total fitting ground other than plowing and listing....... 1,005 803 133 622 
EE ee = ee ee 276 | 554 150 | 316 
ESPEN | ONE CLE oO ee ee 297 | a 222 198 
LDR EE DE LR Sd 3 144 8 | 47 
Parra EGON Cae = Se tee 2 ee cis oe ts Site a a 83 324 11 130 
SGV CSENAD tt Oe hn Sack a dio a noisier sicinere 2 383 539 241 | 375 
LS PIT INTE TPP? CORO) OS ee es Se ae ac a ee a 2 53 59 | 38 
wo SCE TRESS es se eee el ee gee ne Se 17 19 7 | 14 
IG = 35S A ee ee en 3, 031 3, 460 1, 656 2, 638 
The work stock on the farms where tractors were owned did not do 
as much work per head as on the 85 similar farms in the same areas 
where tractors were not owned. (See Table 60.) An average of 624 
hours of horse labor per head was performed on the farms where 
tractors were not owned, compared with 482 hours on the farms 
where tractors were owned. The average tractor did as much work 
as was done by 4.2 head of work stock (2,638 divided by 624) on 
the nontractor farms. In the southern area the average tractor did 
as much work as was done by 4.3 head on the nontractor farms; in 
the western area, 6.1 head; and in the northern area, 2.7 head. 
PROPORTION OF WORK DONE WITH DIFFERENT FORMS OF POWER. 
Table 25 shows the average number of hours of horse labor per 
farm used on the different operations, the horse labor equivalent of 
the drawbar work done by the tractors, the total number of hours of 
horse labor which would have been required if the tractors had not 
been used and the percentage of the total done with tractors. The 
same items are shown graphically in Figure 11. 
Measured by the number of hours of horse labor required, the trac- 
tors did 40 per cent of all the drawbar work on these farms. In the 
southern area they did 45 per cent; in the western area, 46 per cent; 
and in the northern area, 28 per cent. 
The greater part of the work done with the tractors required the 
steady pulling of heavy loads, while a considerable part of that done 
with horses was hauling and other work which did not require the 
