18 
BULLETIN 1248, U. S. DEPARTMENT OF AGRICULTURE. 
Table 7. — Comparative yields from Irish Cobbler potato sets of different sizes at 
the Virginia Truck Experiment Station in stated years — Continued. 
Weight 
of set. 
Yields per 
acre, 
L917. 
Yields per acre, 1918. 
Yields per acre, 1919. 
Kind of set 
planted. 
Primes 
Culls. 
Yield of 
primes. 
Primes 
Culls. 
Yield of 
primes. 
Primes 
Culls. 
Yield of 
primes. 
Ac- 
tual. 
Net. 
tu£. J Net - 
Ac- 
tual. 
Net. 
Whole: 
2-ounce 
Ozs. 
2 
3 
4 
5 
6 
1 
i£ 
2 
f 
f 
1 
H 
Bush. 
163.7 
163.1 
185.7 
177.5 
192.2 
134 
151.2 
167.3 
174.5 
163.4 
125.8 
138.5 
155.0 
131.5 
Bush. 
67.0 
83.1 
91.1 
94 2 
113.5 
49.1 
52.6 
56.8 
58.1 
649 
41.6 
38.4 
35.5 
444 
Per 
cent. 
71.0 
66.2 
67.1 
65.3 
62.9 
73.2 
74 2 
74 7 
75.0 
71.6 
75.1 
78.3 
81.4 
74 8 
Bush. 
142.9 
131.8 
144 
125.4 
129.7 
123.8 
135.6 
146.5 
148.5 
132.1 
118.0 
128.1 
142.0 
118.4 
Bmh . 
196.8 
219.3 
228.3 
244.4 
214 8 
200.7 
220.6 
232.4 
247.5 
205.4 
218.2 
221.1 
226.2 
211.0 
Bush . 
57.0 
74 
82.6 
78.9 
86.7 
42.2 
49.2 
50.9 
49.5 
58.4 
33.5 
38.8 
39.0 
38.2 
Per 
cent. 
77. 5 
74.8 
73.4 
75.6 
Bush. 
174 6 
188.1 
186.6 
192.3 
Bush. 
Bush. 
Per 
cent. 
Bush. 
3-ounce 
4-ounce 
■vnnnfifl 
148.6 
153.2 
102.0 
114 1 
59.3 
57.3 
117.4 
111.5 
6-ounce 
71.2 152.3 
82.6 190.3 
81. 8 205. 
82. 211. 6 
83. 3l 221. 5 
77.91 174 2 
86. 7! 210. 4 
85. 1] 179. 9 
85. 3 221. 5 
84 7 195.4 
Halved: 
2-ounce 
3-ounce 
4-ounce 
5-ounce. . 
165.4 
166.7 
55.0 
64.9 
75.0 
72.0 
149.8 
145.9 
fi-nnriftft 
Quartered: 
3-ounce 
4-ounce 
5-onn pp. 
156.6 
158.9 
35.0 
42.6 
81.7 
78.9 
14a 8 
148.5 
6-ounce 
Average Yields for Three Stated Periods. 
Weight 
of set. 
Average yields per acre, 
1914 to 1918. 
Average yields per 
1915 to 1918. 
acre, 
Average yields per acre, 
1916 to 1918. 
Kind of set 
planted. 
Primes 
Culls. 
Yield of 
primes. 
Primes 
Culls. 
Yield of 
primes. 
Primes 
Culls. 
Yield of 
primes. 
Ac- 
tual. 
Net. 
Ac- 
tual. 
Net. 
Ac- 
tual. 
Net. 
Whole: 
2-ounce 
3-ounce 
4-ounce 
Ozs. 
2 
3 
4 
5 
6 
1 
2 
3' 
3 
1} 
Bush . 
193.9 
216. 24 
225. 62 
Bush. 
70.62 
83.22 
96.04 
Per ' 
cent. 
73.3 
72.2 
70.1 
Bush. 
172.4 
183.9 
181.5 
Bush. 
220.58 
253. 33 
260. 25 
Bush. 
69.33 
81.53 
93.28 
Per 
cent. 
76.1 
75. 7 
73.6 
Bush. 
198.8 
221.1 
216.1 
Bush. 
220.2 
249.7 
260.6 
270.97 
265.00 
183.80 
24S. 60 
251.97 
270. 40 
250. 73 
233. 80 
235.30 
242. 77 
228. 23 
Bush. 
73.4 
85.93 
97.97 
107. 30 
122.80 
49.67 
55.93 
60.17 
62.40 
68. 47 
41.23 
• 
Per 
cent. 
75.0 
74.4 
72.7 
71.6 
Bush. 
199.4 
218.43 
217.40 
218.63 
6-ounce 
Halved: 
2-ounce 
3-ounce 
4-ounce 
227. 32 
170. 86 
213. 16 
230. 22 
112.94 
47.60 
53.94 
60.14 
66.8 
78.2 
79.8 
79.3 
162.5 
179.6 
196.9 
20S. 6 
253.85 
192. 85 
244.15 
258. 15 
119.30 
26.43 
51.95 
57.00 
68.0 
87.9 
82.5 
81.9 
189.3 
179.6 
228.0 
236.7 
68 3 202. 50 
78.7170.00 
81.6 233.00 
80. 7 231. 17 
81. 3 244. 27 
6-ounce 
Quartered: 
?.-onnrfl 
229.22 
67.26 
77.3 
196.8 
255. 75 
65.63 
79.6 
22«. 9 
78. 5 219. 50 
85. 228. 00 
4-ounce. .. 
234 70 
45.70 
83.7 
215.0 
82 9 219. 97 
5-ounce .. . 
44. 07' 84 6 229. 70 
6-ounce..- . 
a 
::::::::::::: 
232. 70 
47.10 
83.2 
217. 2 
48 37 82. 5 213. 57 
i 
As a rule, the data show a gradual decline in the percentage of 
prime potatoes as the size of the set, either whole or cut, increases. 
In 1914 the highest net yield of primes was obtained from 4-ounce 
tubers halved, while the next highest was from the 6-ounce halved 
sets. In 1915 the 4-ounce halved tubers again gave the highest net 
yield and were followed, as in 1914, by the 6-ounce halved tub< 
the 3-ounce whole and 6-ounce quartered following in the order 
ed. In. 1916 the 5-ounce halved tubers, used for ihe first time in 
this experiment, stood at the head of the list, closely followed by the 
