22 
BULLETIN 1248, U. S. DEPARTMENT OF AGRICULTURE. 
Table S. — Comparative yields from Irish Cobbler potato sets of different sizes at 
Presque Isle, Me., in stated years — Continued. 
average Yields for Theee Stated Periods. 
Kind of set Weight 
planted. of set 
Averaee vields per acre, 
1914 to 1918. 
Averase yields per acre, 
1915 to 1918. 
Average yields per acre, 
1916 to 1918. 
Primes. Culls 
Yield of 
primes. 
Ac- 
tual. 
Net. 
Primes. 
Yield of 
primes. 
Culls. 
Ac- 
tual. 
Net. 
Primes 
Culls 
Yield of 
primes. 
Ac- 
tual. 
Net. 
Whole: 
2-ounce... 
3-ounce... 
4-ounce. .. 
5-ounce. __ 
6-ounce. .. 
Halved: 
2-ounce... 
3-ounce... 
4-ounce... 
5-ounce... 
6-ounce... 
Quartered: 
3-ounce... 
4-ounce. . . 
5-ounce. .. 
6-ounce... 
Ozs. 
Bush. \Bush 
2S0. 74 116. 80 
301. 04 133. 84 
296.94 136.26 
P.ct. Bush. 
70. 6 253. 54 
2 260. 24 
68.5 
292.42 
311. 12 107. 10 
242.50 
Bush. Bush. 
301. 10 108. 80 
304,83 138.05 
303.63jl33.2S 
P.ct 
73. 5 
68.8 
77. . 272. OC 
74. 4 270. 30 
298. 68; 187. 30 
296. 35 69. L'o 
299. 75 82. 95 
313. 8S 100. 40 
Bush. 
275. 10. 
265. 83' 
251.60 
61. 5 220. 65 
81.1 
78. 3 
->.-. 1 .■ 
248. 95 
2S8.63 
271. 95 
283. :■ 
280.25 
270.85 
129. 53 
44.68 
47.95 
62.53 
69. 249. 10 
84.8 
85.8 
239.95 
275.63 
81. 3 252. 45 
Bush. Bush 
221.87 113.97 
204. 20 137. 67 
233.07 137.93 
228.83 161.17 
228.90:185.80 
231.33 71.40 
224. 7C| 82. 80 
240. 27 10). 77 
24O.201OL23 
225. 27 126. 00 
P.ct. Bush. 
66. 1 197. 87 
62. S 
58.7 
55.2 
168.20 
185. 07 
168.83 
156.90 
216. 53 
242.63 
231. 53 
231. 17 
47.07 
54.67 
62. 97 
76. 4 219. 33 
73. 1 206. 70 
70. 5 212 93 
70. 4 210. 20 
64. 1 1S9. 27 
82.1207.53 
81. 6 230. 63 
78. 6 216. 53 
75. 5 213. 17 
SIZE OF GREEN MOUNTAIN SETS. 
A similar study, though not so extensive, was made with the 
Green Mountain variety to determine whether different varieties 
gave similar responses from sets of the same sizes. Only four sizes 
were tested in 1914, viz, 2-ounce and 3-ounce whole and halved 
and 6-ounce whole. The largest net yield of primes (Table 9) was 
3- " 
<-- " 
if- " 
e- 
,3- " 
«£_ " 
,5"- " 
6- 
/OO 
200 
300 
*O0 
\SXPU?A//9T/OA/ 
\Ct/£LS 
Is in bushels per acre from Green Moun 
Isle, Me., in 1917 and 1918. 
>ts of different weights at Presque 
obtained from 3-ounce halved. The 2-ounce whole sets came 
-id. 6-ounce whole third, and 3-ounce whole last. Xo further 
study was made with the Green Mountain variety until 1917, when 
siz< - ranging from three-fourths of an ounce to (i ounces were used. 
The L917 experiment was repeated in 1918. The average net yield 
of primes for the two seasons showed that the 6-ounce quartered 
gave the Largest yield. The 4-ounce quartered sets came 
id. 5-ounce quartered third, and 3-ounce halved fourth. (See 
fig. 3 for total 
■c (pi; 
vield. 
