Irrigation By Means oe Underground Porous Pipe ii 
W ater was applied at intervals during one winter on this alfalfa 
held to show the effect of winter irrigation applied in this way. In 
the spring the plants started a very thrifty growth, and no injurious 
effects whatever were noticeable from the winter irrigation of this held. 
The record of the yield from this held is as follows: 
1913— Alfalfa was not cut. 
1914— With subirrigation 3.02 tons. 
1915— 3.02 tons. 
1916— T.5 tons. 
Two irrigations were applied to this held in 1913, three in 1914; 
winter irrigation during the winter of 1914 and 1915, together with 
two irrigations during the summer of 1915. Only one light irrigation 
was given to the held in 1916. 
Fig-. 5.—Subirrigated alfalfa 
CROPS GROWN ON GRAIN FIELD 
Por the season of 1913, immediately after the subirrigation sys¬ 
tem was installed, the grain held was planted to barley and potatoes. 
The irrigation water was immediately turned on, about .1 of a second- 
foot, was kept running in the lines for 15 days, then shut off. The 
crop came up but was very spotted, and as it developed it showed a 
luxuriant growth immediately over the tile lines, becoming gradually 
