20 
BULLETIN 693, U. S. DEPARTMENT OF AGRICULTURE. 
It was in this group that the maximum cost per acre occurred. 
Under the foregoing conditions the area covered per day with the 
disk varied from 5 acres in the Provo district to 14 acres in the Gar- 
land section. 
Occasionally it is 1 necessary to give special cultivation in the prep- 
aration of the seed bed. This is true where the soil happens to be 
in poor physical condition, or infested with weeds. (See fig. 4.) 
Fig. 4. — Special summer cultivation on land infested with wild oats. 
LEVELING. 
The leveler is almost indispensable on an irrigated farm. It is 
usually a homemade affair, and the original cost should not exceed 
the actual cash outlay for the timber which is used in its construc- 
tion. It is built by placing two long planks on edge in a parallel 
position 7 to 8 feet apart; cross pieces similar in width and thickness 
are set between these two pieces, being adjusted to the proper angle. 
The entire framework is fastened together securely. This device is 
drawn over the plowed ground, usually by four horses. Although the 
primary object is to bring the surface to an even grade, more is ac- 
complished than merely leveling the plowed soil. The leveler serves 
to break or crush many small clods, and in this way assists in pulver- 
izing the surface. In the order of operations, leveling occupied an 
intermediate place between plowing and planting. 
