BULLETIN 1447, U. S. DEPARTMENT OF AGRICULTURE 
KINDS AND AMOUNTS OF TRACTOR WORK PER FARM 
TRACTOR DAYS 
PERCENTAGE O 10 20 30 40 50 60 
KIND OF WORK OF TOTAL 
DRAWBAR WORK, HOME 89.8 
DRAWBAR WORK, CUSTOM 9.6 
BELT WORK, HOME 6 
TOTAL-ALL WORK 100.0 
Fig. 2.—Of the total days of tractor work 89.8 per cent consisted of home drawbar 
work ; 9.6 per cent was custom drawhar work ; and 0.6 per cent was home belt work 
VARIOUS DRAWBAR OPERATIONS AND PROPORTION DONE WITH HORSES 
AND TRACTORS ON 3I TRACTOR FARMS, 1922 
ACRES PER FARM 
0 200 400 600 800 1000 1200 1400 
PLOWING 
CONG Willd | 
| 
| 
| 
| 
| | 
SPIKE TOOTH------ Gm 
| 
SPRING TOOTH------ j 
DISKING . 
BEFORE PLOWING - ---W/y 
OTHER DISKING ----- 
| 
DRIGUING=25-- = ==t es ies G 
HARVESTING AND 
| 
THRESHING WITH COMBINE WV/:-_:]tt; 
| 
| 
| | 
WEEDING -=-=- ----— = =— Y 
| 
| 
a Horses Tractors | 
(BUREAU OF AGR ECONOMICS. USDEPTACR | 
Fic. 3.—The principal drawbar operations done with tractors were spring plowing, 
disking before plowing, and harvesting and threshing with combine. The most 
common operations done with horses were spike-tooth harrowing, weeding, and % 
‘illing 
