12 BULLETIN 12-48, U. S. DEPARTMENT OF AGRICULTUEE. 
Schweitzer {82) found that there was a progressively larger yield 
as the size of the set increased. The yield from 1-eye sets was at 
the rate of 89.9 bushels per acre; 2-eye sets, 121.2 bushels; quarters, 
146 bushels; halves, 154.1 bushels; and whole tubers, 186.3 bushels. 
No statement is made concerning the quantity of seed used, nor are 
figures given showing the net yield. In later studies by Buffum 
'(?/, p. 19-22) whole seed gave larger yields than cut seed, but this 
writer states that in no case was there such a large percentage of 
unsalable tubers from the cut seed as from the small whole potatoes. 
Price and Ness (7.2, p. 112) compared one-fourth-ounce sets cut 
from 2-ounce and 4-ounce tubers with one-half-ounce sets cut from 
2-ounce tubers and 2-^-ounce tubers planted whole. The data given 
show a distinct gain of the one-half-ounce sets over the one-fourth- 
ounce piece from the same-sized tuber. The one-fourth-ounce sets 
from the 4-ounce tubers gave a larger yield than those from the 
2-ounce tuber. As might have been expected, a larger total yield 
was obtained from the 2^-ounce whole tubers than from the cut 
seed, but it is questionable whether the actual net yield was 
greater. 
In summarizing the averages of many experiments Rane (73, p. 72) 
says that " it was found that for every 100 bushels of net salable crop 
grown from single eyes there were 114 bushels from two eyes, 131 
bushels from quarters, 139 bushels from halves, and 129 bushels 
from whole tubers. ' ; 
Clausen (25) obtained increased yields from large tubers. He 
believes that large seed tubers insure better results in a dry season. 
He also considers them especially desirable in light soils. In the 
Duke of Bedford and Pickering's (14) comparative studies of the 
value of large, medium, and small whole tubers, the largest yield 
was secured from the medium-sized tubers, the increase being 24 
per cent greater than from small seed and 34 per cent heavier than 
from the large seed. 
Mookerji (64) found that when the same weights of cut seed and 
of whole seed were planted on a given area the cut seed gave the 
larger yield. 
In a comparison of whole tubers with single eyes and cuttings, 
Pendlebury and Foulkes (68) obtained a slightly larger yield of table 
stock from the cuttings than from whole tubers, but the total yield 
was over a ton less per acre. The single-eye sets gave the lightest 
yield. 
Emerson (31, p. 6-10) found that quartered tubers planted L2 
inches apart at the rate of 18 bushels to the acre gave the best value 
per acre less the cost of seed. Half tubers planted 36 inches apart 
gave the next best results, while quarter tubers planted 9 inches 
apart gave the poorest yield. 
A comparison of 8-ounce and 1 -ounce whole tubers for seed pur- 
Eoses made by Waldron (101) resulted in a yield at the rate of 16:5. \ 
ushels of merchantable potatoes per acre from the S-ounce tubers 
as against 66 bushels from the 1-ounce seed. Deducting the cost of 
<v(h\, it was figured that the crop from the former was worth $58.41 
per acre, as against $32.73 from the 1-ounce tubers. 
A trial of whole and cut seed by Smith (88) for four years showed 
an average increase of 112 per cent in favor of the whole seed. 
