10 BULLETIN 1447, U. S. DEPARTMENT OF AGRICULTURE 
HORSE WORK EQUIVALENT OF TRACTOR DRAWBAR WORK ON 
TRACTOR FARMS 
The total number of horse days that would have been required if 
the work requiring motive power had all been done with horses are 
indicated in Table 6. The horse work equivalent of the tractor work 
was arrived at in accordance with the following example: The land 
that was tractor plowed amounted to 421 acres per farm. Where 
Fig. 5.—Hauling sacked grain to market with a six-horse team using trailer wagon. 
An average load for an outfit of this size is about 75 sacks or 175 bushels 
horses were used, an average of 12 hours of horse work was required. 
to plow an acre. Therefore the horse work equivalent of the tractor 
plowing amounted to 505.2 horse days per farm (12 42110). 
TABLE 6.—Horse work equivalent of tractor drawbar work and proportion of 
different operations done with tractors on 31 tractor farms, 1922 
Horse i 
Ware work | Total | Percent- 
fo equiva- | horse | age done 
Operation vere Ber lent of | work per} with 
of trac- farm tractor 
tor work 
Days 3 Days Days Per cent 
1 ACO} 6 0 0am ae en Meet aD ems SDS Toke bw Seek SS Lk Rees Ves 159. 4 505. 2 664. 6 76 
Harrowing: 
Spike toot hiss. ss. se tes ply nae we Magee ke ep ees 197.4 18.6 216. 0 9 
SPE E COOCH ons SEs Ae es Atacama 7.3 5. 4 NPA 7 43 
MDiSkimp es Sects ye Bek 5 TA Fa Eee Etiam pia ce 8.7 128.1 136.8 94 
1 E40) UU a Y= ARR fe Soe Die eet ul eee a nee ebro) SL ear eo ee BS JE | Rie eres 5 3 Naa i 
IWiee Ing Size SS 2 i RRA eRe as Se ea eC eee a eee 122. 2 12.2 134. 4 9 
Dpillingsxers ia eee ee ee Se nn ee ee 104. 4 24.4 128.8 19 
Harvesting and threshing: 
With combine? 242 St GT eres ses eee 67.0 334. 5 401. 5- 84 
With header and stationary thresher_____________--___-_-_- aU Le a Ne Miro ri 3 2 DW Qhic Re ene 
Haying and hauling chaff and straw______._________---___----- Rn Os Sees See Oe F250) | LOO 
Pickingup grain sacksjand hauling} so.) TLS Fal nes hana SL BEI sc ge eae 
Miscellaneous WORK so0s252 ooo Se a a ee ede eae ee 9.3 6. 2 a5 40 
