18 
BULLETIX 1348, U. S. DEPARTMENT OF AGRICULTURE 
Many local factors affect the power requirements of farm opera- 
tions, and these must be given consideration in estimating the power 
requirements for any specific condition. Some of these factors are 
chmate, type and condition of soil, depth of the operation, condition 
of the crop or commodity the operation is apphed to, size of fields, 
size and type of power units used, mechanical efficiency of the tools 
♦ l.OOO 
$?,000 
^3^000 
VnifedSfafes.. 
Alabama 
South Carolina- 
Mississippi 
Georgia 
North Caro!in&^ 
Florida 
Arkansas 
Tennessee 
Kentucky 
Louisiana 
l/Zrainia 
y/esf l/irg/n/a. 
Rhode inland. 
Connecticut 
Texas 
Massachusetts. 
Maine 
Mary /and. 
New Hampshire - 
t/ermonf..^ 
New Jersey. 
Delaware '. 
Oklahoma 
Arizona 
A'ew York 
Missouri. 
Pennsvli/ania. 
Utah.. 
Michigan 
Ohio „ 
Indiana ._ 
Wisconsin 
New Mexico.., 
Nevada 
Minnesota 
ColpradQ . 
Ill mo is. 
Oregon. 
PVashrngfori... 
l/i/yoming. 
tdaho 
Iowa 
Kansas 
Nebraska. 
Montana 
South Da koto.. 
California.... 
Aorth Dakota.. 
\ 2 
Horsepower Hours 
Fig. 20.— Relation between horsepower-hours of power utilized per hour of human labor on farms 
and net income per farm operator for the year 1910. Horsepower-hours estimated. Income 
from National Bureau of Economic Research 
or machines used, and the local practices followed in carrying out 
each particular part of an operation. 
The time required for accomplishing a farm operation will de- 
pend upon the size of the machinery or implement used, the speed 
with which it works, and the time lost while not actually working. 
In field work the lost time is due to time required for turning at 
