Irrigation By Means of Underground Porous Pipe 
excess of rainfall came^ yet it was so distributed that the summer was 
without any drought and crops not irrigated did about as well as crops 
under irrigation. For this reason it was not considered a fair test for 
the subirrigation system and no records were kept for the season of 
1915- 
GRAIN FIELD FOR 1916 
Corn was again ])lanted on this field for the season of 1916. It 
came up well and for a tinm gave promise of again giving a good 
yield. The season of 1916 was normal in this section of the State, 
and gave a sphndid test of the effect of the irrigation water upon the 
corn crop on this field. Two irrigations were given during the season, 
and at the end of the same 12,411 pounds of corn were harvested for 
ensilage. The corn on this field during the season showed again the 
injury due to insufficient water between the tile lines, and tall thrifty 
corn grew directly over or in the vicinity of the tile lines, with a short 
stunted growth midway between the same. This is well shown in the 
accompanying photographs Figs. 8 and 9. Figure 8 shows the corn 
growing upon the subirrigation tract, and it is to be noted that the stalks 
midway between the two lines are as high as the waist of a man stand¬ 
ing in the field. Whereas, the corn at the right and left of him im¬ 
mediately over the tile line is more than 6 feet high. This is good for 
Colorado corn. 
Fig. 9 shows an adjoining corn field planted at the same time, 
and given the same attention as that shown in Fig. 8, with the excep¬ 
tion that this corn field was surface irrigated in the ordinary way. The 
height of this corn is uniform and is approximately the same as the 
height of the corn directly over the tile lines shown in Fig. 8. 
Fig-. 8.—Subirrigated Corn 
