SIZE OF POTATO SETS. 
27 
the 4-ounce whole tubers considerably exceeded all others, being 
400.3 bushels, as compared with 380 bushels from 6-ounce whole 
and 350.7 from 5-ounce whole tubers. The 3-ounce whole and 6- 
ounce halved tubers were nearly tied for third and fourth places. 
In 1917 the 3-ounce whole tubers gave the largest net yield, 302.3 
bushels. Their next nearest competitor, the 5-ounce whole tubers, 
yielded 263.7 bushels. The 4-ounce and 2-ounce whole made 259.5 
and 255.6 bushels, respectively. The highest average net yield for 
the two seasons was obtained from 4-ounce whole tubers, closely 
followed by 3-ounce whole tubers. The former showed a net yield 
of 260.6 bushels, as against 252.3 bushels from the latter. Tne 3- 
ounce halved tubers came third with 244.6 bushels. The 2-ounce 
whole and 3-ounce quartered sets occupied fourth and fifth positions, 
respectively. In total average production of primes the 4-ounce 
whole tubers stand first, the 6-ounce whole second, the 3-ounce 
whole third, and the 5-ounce whole tubers fourth. (Fig. 6.) 
/-cower /r/jVAE- 
2- " 
4JX> 
Fig. 6.— Average vields in bushels per acre from Russet Burbank potato sets of different weights at Jerome, 
Idaho, in 1916 and 1917. 
COMPARATIVE YIELDS FROM SETS OF THE SAME WEIGHT. 
A comparison of the sets of the same weight throws an interesting 
light on the behavior of whole, halved, or quartered sets of the 
same size. For convenience of study the data from comparable- 
sized sets tested at Presque Isle, Me.^ Norfolk, Va., Greeley, Colo., 
and Jerome, Idaho, regardless of variety, are presented in Table 12. 
A study of these data shows that while there are some discordant re- 
sults both in primes and culls, there is on the whole a fair degree of 
agreement. The columns containing the average of all the data and 
the total vieid of a given size of set show that it does not make any 
serious difference in the total vield whether it is whole, halved, or quar- 
tered, except possibly in the case of the 3-ounce set, in which the whole 
tuber proved somewhat superior to a 6-ounce halved set. 
