COST OF USING POWER ON WHEAT FARMS IN OREGON 39 
COST OF HARVESTING AND THRESHING WHEAT WHERE HORSE- 
DRAWN AND WHERE TRACTOR-DRAWN COMBINES WERE USED 
The records have been grouped in Table 37 by size of combine 
to show the relative cost of combine harvesting and threshing where 
horses and where tractors were used. Over the three-year period, 
1920-1922, 78.6 per cent of the total harvested wheat acreage was cut 
and threshed with motor-driven combines, 14.1 per cent with ground- 
power combines, and 7.3 per cent with headers and _ stationary 
threshers. Of the wheat acreage harvested with motor-driven com- 
bines approximately 60 per cent was with horse-drawn and 40 per 
Fic. 11.—Harvesting and threshing wheat with a 9-foot cut horse-drawn combine. 
Of the wheat acreage cut with horse-drawn combines 64.2 per cent was with com- 
bines of 14-foot cut, or smaller sizes 
cent with tractor-drawn combines. The horse-drawn machines were 
mainly of the 14-foot and smaller sizes, whereas most of the tractor- 
drawn machines were of the 16 to 22 foot sizes. (Figs. 10 and 11.) 
TABLE 37.—Cost of harvesting and threshing wheat where horse-drawn and 
where tractor-drawn combines were used, 3-year average, 1920-22 
HARVESTED AND THRESHED WITH HORSE-DRAWN COMBINES 
Average H 
ours and cost per acre 
Pee: Aver- crew p c z ; 
Size of combine cent- | 28° |———__— ota 
(length of cutter Bes | nae age a Man Horse Use of con 
bar) Bore | 6 of labor work combine ee 
total day Men Horse 
Hours; Cost |Hours} Cost |Hours) Cost 
Feet No. | Acres |P.ct. | Acres} No. | No..| No. | Dolls.| No. |Dolls.| No. |Dolls.|Dolls. 
Se eS eee Sala 208. lose ts.6 7472 8.4 16/)0.91} 6.1 | 0.738 ied bal ox UL 3.41 
iz and (4 52 18, 591 | 21.1 | 18.9 3.0 | 12.1 5 .89 |} 6.3 . 62 ay) fea yal 3. 22 
iGand 5 = 17 | 5, 754 625 S2a2 5.1 | 24.4 1.6 . 90 (Ae he <3 | 1293 3. 60 
13, 053 5.4 | 27.6 126315: OL 8.1 .81 -3 | 1.69 oe OL 
