18 
BULLETIN 3, U. S. DEPARTMENT OF AGRICULTURE. 
In Table IX the original averages for the widths most frequently 
used, shown in the second column, have been given, together with 
adjustments for these acreages and a scale of allowances for other 
widths of rollers. From the table, computations can readily be made 
for determining the daily duty of any team and width of roller. 
Table IX 
s IX. — A normal day's work with a land roller, giving the average daily acreage 
reported for the widths most frequently used and adjustments for other widths. 
[Net hours in The field, 9.65.] 
Width of roller. 
Rolled 
per day. 
Number 
averaged. 
Adjusted 
acreage. 
Allowance 
Number of horses. 
Eange. 
Most 
common 
width. 
for each 
foot in 
width. 
2 
Feet. 
5-12 
6-14 
Feet. 
8 
8 
Acres. 
13.2 
13.5 
15.2 
442 
24 
12.0 
12.5 
Acres. 
1.10 
3 
1.15 
4 
8-18 
s 
37 
14.0 
1.20 
PLANTING OPERATIONS. 
With the grain drill the popular sizes range between 4 and 12 feet in 
width, a greater number, 23 per cent, using the 8-foot width than 
any other, with the 6-foot width next. Only 9 per cent use three 
horses with grain drills, two horses being used by 46 per cent and 
four horses by 41 per cent of farmers. From the general averages it 
was seen that the acreage per day per foot of width increased with 
added power, suggesting a slight overload per horse on the smaller 
drills with 2-horse teams. The larger teams are used on the larger 
fields. It was found also that with increasing width and power the 
acreage planted per day increased, except for the 12-foot width, the 
limit of practicable width from a mechanical standpoint doubtless 
being approached in this size. In general, each horse can be loaded 
with 2\ to 2| feet in width of drill, and should be expected to cover 
from 4 to 4.5 acres in a day. The duty of each foot in width of drill 
is from 1.5 to 1.75 acres per day, assuming adequate power. When 
the grain-drill data were arranged by length of the field it was found 
that between lengths of 40 and 160 rods there appeared to be no 
advantage hi favor of larger fields. This was found to be true of 
other data arranged by distance hauled or length of field, indicating, 
without exception, that within the limits of 40 to 200 rods distance 
is not a factor in the day's work. 
In Table X, for gram drills, the average acreage for the most common 
widths and teams is presented, together with adjusted acreages and 
a table of allowances for other widths. From this table reasonable 
widths of drills for each size of team can be chosen and the daily duty 
of any width found from the factors in columns 6 and 7. 
