SIZE OF POTATO SETS. 
31 
4-ounce whole seed shows a lower average number of tubers than 
that from 3-ounce whole sets. The second exception occurs between 
5-ounce quartered sets, which show a lower average number than 
the 3-ounce and 4-ounce sets. 
The Kusset Burbank data show a fairly uniform increase in the 
number of tubers as the weight of the set increases. 
Comparison of the average number of tubers to the stem shows a 
greater lack of agreement than in the other two sets of data, but in 
general it is evident that the number of tubers per stem are inversely 
proportional to the size of the set. These results coincide with those 
published in 1892 by Arthur (10) in which it was found that as the 
number of stems per set increased there was a progressive diminution 
in the average number of tubers to the stalk. 
A summary of the foregoing data of the five varieties studied, as 
presented in Table 15, shows with but one exception that as the weight 
of the set increases, whether of whole, halved, or quartered seed, 
there is a progressive increase in the average number of stems to the 
set. The exception noted is in the 6-ounce halved sets of the Green 
Mountain variety, which gave a slightly smaller number of stems 
than the 5-ounce halved sets. 
A comparison of the average number of tubers produced to the 
set by each of the five varieties shows that with but two exceptions 
the number of tubers increases with the weight of the set, provided 
such comparison is made separately between whole, halved, and 
quartered sets. The two exceptions noted relate to the Charles 
Downing variety. The 4-ounce whole sets of this show a slightly 
smaller number of tubers than the 3-ounce whole sets and the 5-ounce 
quartered sets smaller than the 4-ounce quartered sets. 
Table 15. — Relation of the size of set to the average number of stems and tubers 
per set of five varieties of potatoes as grown in Virginia, Maine, Colorado, and 
Idaho in stated years. 
Average numbei 
of stems per set. 
Average number of tubers per set. 
1915 to 
1918; Irish 
Cobbler. 
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1916 and 1917. 
1915 to 
1918; Irish 
Cobbler. 
CD 
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3 03 
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3 .- 
^£ 
05 
1916 and 1917. 
Kind of set planted. 
03 
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35 
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p 
Jerome, 
Idaho. 
03 
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Idaho. 
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CD p| 
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w si 
cd a 
03 £ 
Q 
Si 
Whole : 
1.75 
2.55 
3.20 
3.65 
4.45 
5.00 
1.80 
2.25 
2.45 
2.65 
3.05 
1.50 
1.60 
1.85 
1.95 
2.45 
3.30 
4.45 
4.70 
5.30 
6.05 
2.10 
2.65 
2.90 
3.25 
3.50 
1.90 
1.95 
1.95 
2.00 
2. 15 
3.05 
3.85 
4.30 
4.75 
5.20 
2.15 
2.70 
2.85 
3.20 
3.40 
1.85 
1.90 
2.15 
2.35 
4.20 
6.30 
7.15 
7.95 
9.10 
10.05 
4.00 
4.80 
5.25 
5.65 
6.30 
3.30 
3.65 
3.90 
4.15 
6.20 
9.15 
11.35 
11.30 
13.10 
13. 35 
6.85 
7.85 
8.75 
9.10 
9.80 
6.40 
6.50 
5.80 
6.85 
5.55 
2-ounce 
3-ounce 
4-oun ee 
2.78 
3.20 
4.05 
3.88 
5.00 
6.15 
3.17 
3.54 
4.61 
5.15 
5.83 
2.12 
2.21 
2.67 
3.18 
3.08 
1.51 
1.82 
1.83 
1.84 
9.26 
10.62 
11.90 
10.13 
11.65 
13.13 
9.50 
10.09 
11.04 
11.25 
13.55 
5.75 
6.71 
7.57 
8.34 
8.69 
4.92 
5.42 
6.11 
7.19 
6.55 
7.95 
9.50 
9.65 
6-ounce 
Halved: 
2-ounce 
3-ounce 
4-ounce 
5.22 
1.85 
2.21 
2.51 
7.49 
2.54 
3.14 
3.79 
13. 77 
6.95 
7.42 
8.31 
"§."85 
6.12 
6.21 
15.14 
7.58 
8.61 
9.81 
~lL05 
6.09 
6.99 
9.90 
5.20 
6.05 
6.45 
6.50 
6-ounce 
Quartered : 
3-ounce. 
4-ounce 
2.92 
1.63 
1.66 
4.39 
2.10 
2.33 
7.40 
4.65 
4.75 
5.15 
6-ounce 
1.95 
2.63 
7.13 
7.56 
5.40 
