JO 
C01.0RAD0 Experiment Station. 
son. TEMPJ5]HATURES AT LONGMONT, COLORADO. 1911—Continued. 
At Two Inches At Six Inches 
Date.s 
S A. M. 
Degrees F. 
5 P. M. 
Degrees F. 
8 A. M. 
Degrees F. 
5 P. 1 
Degree 
August 
5_•. 
. 79 
95 
74 
85 
August 
6. 
. 78 
95 
76 
88 
August 
7. 
.’88 
99 
77 
90 
August 
8. 
. 84 
101 
77 
90 
August 
9. 
. 84 
94 
78 
85 
August 
10. 
. 83 
85 
78 
83 
August 
11. 
. 79 
91 
74 
84 
August 
12. 
. 80 
92 
74 
88 
August 
13. 
00 
0 
\ 
94 
75 
88 
August 
14. 
.... 80 
99 
76 
90 
August 
15 . .. 
. 86 
94 
77 
91 
Avigust 
16.. 
. 80 
83 
77 
82 
August 
17. 
• . 
August 
18. 
August 
19 . 
. . 
August 
20. 
. . 
August 
21. 
. . 
August 
‘>0 
. 73 
81 
73 
79 
August 
23. 
87 
71 
81 
Au.gust 
24 . . .- . 
. 71 
74 
71 
75 
August 
25. 
. 70 
90 
66 
81 
August 
26. 
. 75 
88 
69 
82 
August 
27. 
. 73 
81 
72 
77 
August 
28.'. 
. 75 
89 
69 
81 
August 
29. 
. 74 
86 
70 
82 
August 
30. 
. 76 
95 
^ 71 
86 
August 
31 .... 
. 77 
90 
72 
85 
Averages . 
. 7,S 
«» 
74 
S.3 
IL STUDIES OF POTATO ROOTS AND THE POTATO 
LEAF. 
During the seasons of loii and 1Q12 field studies of potato 
roots were made at Del Norte, Carbondale, Kersey, Greeley, Fort 
Morgan and in a dry land district at Haxtum. Holes about 3x10 
feet were dug across two rows of potatoes and deeper than potato 
roots were found, the latter being identified when very small by the 
taste. The accompanying diagram (Figure 2) illustrates the root 
habits determined by these studies. 
Potato roots in open, well-drained, sandy loams go to a consid¬ 
erable depth, limited apparently by the size of the plant, and extend¬ 
ing as much as four feet below the seed piece. In the case of Peach- 
blows the distance N to .R is often as much as five feet. Early 
Ohios, under tlie same conditions, go down not to exceed three feet 
and to the side not to exceed four feet. A¥e found that deep cultiva- 
