Studies oe Health in Potatoes. 
23 
that the ground water level was kept at one foot from the surface 
of the soil in one tank and at two feet, three feet and four feet for 
others. Numbering the tanks according to the distance to water, 
the results were as follows: 
YIELDS rmOM SUB 
-IRRIGATION 
TANKS. 
Total Weights 
No. of 
No. 
Tanks 
Nos. 
of TuVjers 
l^^arge Tubers 
of Culls 
Quality 
1 
4 
S.5 lbs. 
IS 
23 
Very poor 
2 
3 
6.0 lbs. 
12 
S 
Poor 
3 
3 
9.0 lbs. 
17 
8 
Fine 
4 
2 
6.5 lbs. 
12 
18 
Good 
It was regrettable that an even number of hills were not se¬ 
cured for comparison, but it was very evident to the observer that, 
for the fine, mello'W garden loam used, three feet deep is the proper 
level for the irrigation water where subbing is practiced. The 
leaves of the plants in No. i and No. 2 were badly rolled, and the 
potatoes inferior. In No. 3 the tubers were larger, few were small 
and the total weight of tubers fit for table use was most in the 
aggregate and per hill. No. 4 showed signs of drouth and did no't 
make as many of its tubers of desirable size as an average plant 
should produce. 
It is the keen desire of many thoug'htful men that eventually 
the sub-irrigation system may be eliminated. It is calculated that 
row irrigation will take less water per acre and that the drainage 
system that should be installed with a new system of irrigation will 
make it possible to use the water several times, and largel)^ increase 
the acreage that can be planted, and the prosperity and future secu¬ 
rity of the agriculture empire, which lies west of the magnificent 
Sangre de Christo range. 
At Greeley, in 1912, in co-operation with Mr. E. R. Bliss, two 
experiments were performed in studying the conditions necessary 
for potato health. One small patch of ground was shaded bv a 
J 10 ^ 
Fig’ure 15.—Shading’ the ground did noL do much good in J012. 
