18 
BULLETIN" 757, U. S. DEPARTMENT OF AGRICULTURE. 
size of farms in North Dakota. Xone but large farms can utilize 
these labor-saving implements efficiently. 
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Fig. 8. — The gang plow drawn by the five good horses turns from 5 to 6 acres in a day. 
The gang plow (fig. 8) cuts two furrows of 12 to 14 inches each; 
the most common gang is the 28-inch. The majority of farmers use 
five horses on the gang plow, although a large number use only four. 
Fig. 
-The spike-tooth harrow covers from 40 to 60 acres per day, depending upon 
the width of the harrow and size of the team. 
A very few use six horses on this implement. Usually three horses 
are placed abreast and two in the lead, but when four horses are used 
they are generally driven abreast. 
