38 BULLETIN 1447, U. S. DEPARTMENT OF AGRICULTURE 
TABLE 36.—EHffect of days of work and acres cut on cost per day and per acre 
of using combines, 61 combines, 1922 
Annual days of work 
Item 
Less 30 and 
than 20 20 to 30 over 
Cont ines = oo ee 2 ae Soe SO ee eee ee yk eee ee ea a number_-_ 22 25 14 
“Dillable:acreage iperdtarm: $2552 20k. Se a ee RE 3 aoe acres __ 722 926 1, 193 
Acreage COMDINC = f= ok see oe nee ee ee Se ee ee do25-% 416 555 688 
EOmesWOrk. per .COMDINGL ss oto see een ee See ele ene eee ret days-_- 13.6 20. 5 Zia 
Custom: work per combines 4 yes = a ee A 5 Pe ee ee Ne qdoiass ER 227) bel 
Rartnership work: per combpIN@ =o see See oc eee ee dors 20 .6 0 
AT works per. combine! 2s ou Siete Poids Cin Pee De ee dow 16.4 23. 8 32.2 
Cost of using combine: 
DY) (Se lg am cI be pa ee Sate Sled See Ren ae ae dollars __ 76. 18 117. 04 143. 78 
Orlsiandigrease: 2 os 2S Se ee eae ee ae do322 28. 63 35. 40 33. 64 
Repairs. 22-2 #2 55 le es ae ee ee GOee= 2 e235 82 214. 80 253. 80 
TnSurance 33 24 kar eS SS Ee ee 2 ee a Se ee doa 25. 73 29. 96 34. 64 
Depreciation ..2.2._ 222 Uk = es ee 2 Sees oe Se eee do_.--| 345.32 383. 12 360. 00 
Motali eee te tee a a ae ee ee eee eer nen eee eee do._._| 689.68 | 780.32 825. 86 
Wn Genes t =e ee eh ee ee i Pee ae ee ee does 82.45 | 113.24 91. 64 
AMGtaliCOSh=s oS hoe ie eee EE ae ee do__..| 772.13 | 893.56 917. 50 
Cost perl O-hour, day ofuse= 222 ee hee ee a ee ee ee ee ee ages 47. 08 37. 54 28. 49 
Cost per acre. harvested . 2. = 2222-5 5 Ba ee ee ee gdooe== 1. 86 1. 61 1.33 
Forty-one per cent of these machines were used for custom work, 
and 6.6 per cent were owned in partnership. On the four farms 
where thé combines were owned in partnership the days of annual 
use averaged 32.5 per cent greater than on farms of the same size 
Fic. 10.—Harvesting and threshing wheat with a 16-foot cut tractor-drawn combine. 
Ninety-three per cent of the wheat acreage harvested with tractor-drawn combines 
_was with machines of the 16-foot cut or larger sizes 
where they were not owned in partnership. Although the amount 
of work done annually has a direct bearing on the cost per day 
or hour of use, it is not always convenient or desirable for some 
farmers to do custom work or to own a machine in partnership. 
This is a matter the individual must decide for himself, taking into 
consideration the local conditions with respect to acreages, coopera- 
tion, amount of home work, etc. 
