30 
BULLETIN 917, U. S. DEPARTMENT OF AGRICULTURE. 
given. One man will irrigate 6 to 10 acres a day. This variation 
holds for all crops. 
The grain crops of the northern areas are usually irrigated twice — 
once about June 1 and again about June 20. One man will irrigate 
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Fig. 22.— Irrigating sugar beets. This illustrates the method of letting the water out of the lateral into 
the furrows between the rows. 
from 4 to 10 acres of grain in a day. In irrigating grain and alfalfa 
it is customary to let the water run on the crop 24 hours of the day. 
Some farmers remain continuously in the field attending to the 
distribution of the water, while others are so situated that the water 
can be set and allowed to run three to five hours without attention. 
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Fig. 23.— Irrigating sugar beets. This illustrates the use of canvas checks to turn the water out of the 
lateral into the furrows between the rows. 
Row cultivated crops, such as beets, potatoes, beans, and cantaloupes, 
may also be irrigated by having a man in continuous care of the water 
or by making sets and letting the water run a few hours. This 
practice depends upon the head of water, slope of the land, type of 
