DEVELOPMENT OF TUBERS IN THE POTATO. 
17 
LENGTH OF STOLON AND ITS POSITION ON THE STEM AS RELATED TO THE SIZE OF THE 
TUBER. 
The experiments of 1917 had shown that there was great inequality 
in the rate of growth and consequently in the size of the tubers. 
To determine whether this condition was associated with the length 
of the stolon which bears the tuber and its position on the stem, 55 
hills were dug in the fall of 1918, after the plants had reached matu- 
rity, and the stolons were measured and the tubers weighed. The 
variety used for this purpose was the Charles Downing. Early in 
the season, before the tubers had begun to set, the plants were thinned 
to a single stem, to avoid influences which might arise from the 
presence of. several stems in the hill. All the measurements and 
weights obtained are shown in Table IV. 
Table IV. — Length of each stolon and weight of the tuber which it produced in 55 hills of 
Charles Downing potatoes grovm at Greeley, Colo., in 1918. 
[The stolons in each hill are numbered in accordance with their relative position on the stem of the 
plant, beginning with the lowest.] 
Plant and stolon. 
Length 
of 
stolon . 
Weight 
of tuber. 
Plant and stolon. 
Length 
of 
stolon. 
Weight 
of 
tuber. 
Plant No. 1: 
Stolon 1 
Mm. 
15 
54 
65 
50 
15 
85 
18 
86 
77 
12 
30 
42 
50 
5 
45 
54 
34 
2 
27 
155 
12 
35 
83 
4 
23 
17 
113 
115 
125 
75 
25 
18 
17 
30 
17 
27 
36 
30 
Grams. 

247 
335 

100 
340 
38 
38 
7 
115 
94 
67 
112 
325 
120 
256 
33 
197 
1 
175 
160 
150 
151 
125 

27 
193 
103 
123 
23 
446 
103 


151 
88 
120 
70 
Plant No. 12: 
Stolon 1 
Mm. 
100 
124 
63 
147 
146 
148 
205 
130 
50 
110 
80 
34 
163 
130 
85 
186 
112 
91 
107 
90 
62 
22 
95 
25 
3 
70 
162 
58 
80 
34 
17 
77 
305 
170 
25 
23 
127 
Grams. 
125 
Stolon 2 
Stolon 2 
115 
Stolon 3 
Stolon 3 
no 
Plant No. 2: 
Stolon 4 
226 
Stolon 1 
Plant No. 13: 
Stolon 1 
Stolon 2 
191 
Stolon 3 
Stolon 2 
138 
Stolon 4 
Stolon 3 
110 
Stolon 5 ' 
Stolon 4 
13 
Stolon 6 
Plant No. 14: 
Plant No. 3: 
68 
Stolon 1 
Stolon2 
150 
Stolon 3 
162 
Stolon 3 
Plant No. 15: 
Stolon 1 
Stolon 4 
264 
Plant No. 4: 
Stolon 2 
154 
Stolon 1 
Plant No. 16: 
„. , (I 
Stolon 2 
283 
Plant No. 5: 
Stolon a< 2 
218 
„., (I 
Stolon 3 
46 
Stolon a. i 
Stolon 4... * . 
12 
Plant No. 6: 
Stolon 1 
Plant No. 17: 
Stolon 1 
Stolon 2 
Stolon 3 
Stolon4... 
Plant No. 18: 
Stolon 1 
Stolon2 
Plant No. 19: 
Stolon att 
122 
Stolon 2 
121 
Stolon 3 
143 
Plant No. 7: 
Stolon 1 
124 
Stolon 2 
199 
Stolon 3 
203 
Plant No. 8: 
84 
Stolon 2 
86 
Stolon 3 
142 
Stolon 4 
Plant No. 20: 
Plant No. 9: 
130 
Stolon 1 

Stolon 2 
235 
Stolon 3 
Plant No. 10: 
Plant No. 21: 
241 
Stolon 1 
Stolon 2 
Stolon 3 
Stolon 2 
Plant No. 22: 
Stolon 1 
Q , , (2 1 
137 
383 
Stolon 4 
119 
Stolon 5 
Stolon u-L 
258 
Plant No. 11: 
Stolon 1 1 
Plant No. 23: 
Stolon 1 
266 
Stolon 2 .' 
114 
Stolon 3 ! 
Stolon 3 
177- 
a Both stolons arising from the same node. 
