DEVELOPMENT OF TUBERS liS^ 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 inequahty 

 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, 5.5 

 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 tuhich it produced in 55 hills of 

 Charles Downing potatoes grown 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 

 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 1 



Grams. 







247 



335 





 100 

 340 



38 



38 



7 



115 

 94 

 67 



112 



325 

 120 



256 

 33 



197 



1 

 175 



160 

 150 

 151 



r25 







27 



193 



103 

 123 

 23 



446 



103 











151 



88 

 1-20 

 70 



Plant No. 12: 



Stolon 1 



Stolon 2 



Stolon 3 



Stolon 4 



Plant No. 13: 



Stolon 1 



Stolon 2 



Stolon 3 



Stolon 4 



Plant No. 14: 



Stolon 1 



Stolon 2 



Stolon 3 



Plant No. 15: 



Stolon 1 



Stolon2 



Plant No. 16: 



„. , fl 



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 

 SO 



34 

 17 



77 

 305 

 170 



25 

 23 

 127 



Grams. 

 125 



Stolon 2 . . 



115 



stolon 3 



110 



Plant No. 2: 



Stolon 1 



226 



Stolon 2 



191 



Stolon 3 



138 



Stolon 4 



110 





13 



Stolon 6 





Plant No. 3: 



Stolon 1 



68 

 150 



Stolon 2 . . 



162 



Stolon 3 





Stolon 4 



264 



Plant No. 4: 



Stolon 1 



154 



Stolon 2 



283 



Plant No. 5: 



£,. , fl . . .. 



Stolon 3 



Stolon 4 



Plant No. 17: 



Stolon 1 



Stolon2 



Stolon 3 



Stolon 4 



Plant No. 18: 



Stolon 1 



Stolon2 



Plant No. 19: 



ot , fl 



218 

 46 





12 



Plant No. 6: 



Stolon 1 



122 



Stolon 2 



121 





143 



Plant No. 7: 



Stolon 1 



124 



Stolon 2 



199 



Stolon 3 



203 



Plant No. S: 



Stolon 1 



84 





Stolon 3 



Plant No. 20: 



Stolon 1 



Stolon 2 



Stolon 3 



Plant No. 21: 



Stolon 1 



Stolon2 



Plant No. 22: 



Stolon 1 



Stolon ail 



Plant No. 23: 



Stolon 1 ■. 



Stolon2 



Stolou 3 



^6 



Stolon 3 



142 







Plant No. 9: 



Stolon 1 



130 

 



Stolon 2 



Stolou3 



Plant No. 10: 



8tolon 1 



235 



241 

 137 



Stolon 2 



Stolon 3 



3^3 



Stolon 4 



119 





258 



Plant No. 11: 



Stolon 1 



266 



Stolon 2 



Stolon 3 : 



114 



177 



<i Both stolons arising from the same node. 



