STANDARD DAY S WORK IN" CENTRAL ILLINOIS. \) 
THE DISK HARROW. 
The disk harrow is used on nearly every Corn-Belt Farm. Eighty- 
five per cent of the men from whom these reports were received own 
them. They are used for working up fall plowing in the spring and 
for preparing corn stubble for oats, as well as on freshly plowed 
ground. Practically all of these implements are single disks, and the 
8-foot width is the most common, although the 7, 9, and 10 foot sizes 
are found on some farms. All of the men reporting 7- and 8-foot 
disks stated that they use four horses on them. Four horses were re- 
Fig. 2. — The 3-bottom tractor covers 8.G7 acres per day in spring and 8.06 in the fall. 
ported most often for the 9-foot size, although some farmers use 
five or six horses. Four, five, and six horse teams were reported for 
the 10-foot disk, the 6-horse team being the most common. 
Table VII. — Disk harroio on well-packed land. 
Width. 
Number of 
horses. 
Number of 
reports. 
Acres per day. 
Average. 
Acreage most 
often reported. 
Feet. 
7 
8 
9 
10 
4 
4 
4 
6 
52 
350 
15 
17 
15.4 
17.4 
18.9 
23.5 
15 {13 reports). 
/18 {86 reports). 
\20 {91 reports). 
Scattering. 
Do. 
138712°— Bull. 814—20- 
