SWEET-POTATO STORAGE STUDIES. 
11 
follows : Triumph, 6.75; Porto Rico, 7.10; Nancy Hall, 6.77 ; Southern 
Queen, 7.10; Pumpkin " Yam," 8.51; Dooley, 9.62; Eed Jersey, 6.34; 
and Yellow Jersey, 7.11 per cent. 
Shrinkage continued throughout the storage period, but was great- 
est during the curing period, and the rate gradually decreased to 
the end of storage. The shrinkage due to loss of moisture during 
the curing period, which averaged 20 days, was nearly half the loss 
for the entire storage period of 160 days. 
The average loss in weight for all varieties for the entire storage 
period was 16.52 per cent, the lowest being 12.96 per cent for the 
Pierson and the highest 21.01 per cent for the Gold Skin variety. 
The heavy loss in the latter was caused largely by the drying of 
decayed potatoes. The sweet potatoes in this experiment were in 
storage for a longer period than is usual in commercial houses. In 
fact, the average storage period for sweet potatoes is probably not 
more than three months, since marketing usually begins soon after 
the potatoes are stored and continues until all are removed. Very 
few sweet potatoes remain in storage longer than four months, so 
that the 113-day period is more nearly comparable to commercial 
storage than 160 days. 
Table 5. — Relation of variety to the keeping quality of sweet potatoes stored 
in crates. 
[Shrinkage and decay averages in storage-house tests during four seasons.] 
Variety. 
Average 
weight 
of pota- 
toes at 
harvest 
time. 
Shrink- 
age 
during 
curing, 
20 days. 
Shrinkage at end of— 
50 days. 
83 days. 
113 
days. 
142$ 
days. 
160 
days. 
Loss 
due to 
decay 
for 160 
days. 
White Sealy 1 
Belmont 
Georgia (old-time "yam") . . . 
Yellow "Yam" 
Vineless Pumpkin "Yam" 2 . 
Pierson 
Yellow Strasburg 
Triumph 
Haiti 
Red Bermuda. . . _ 
Red Brazil 
Key West 
Porto Rico 
Creola 
Dahomey 
Florida 
General Grant Yineiess 
Nancv Hall 
White "Yam" 
Southern Queen 
Pumpkin "Yam" 
Norton 
Dooley 
Red Jersey 
Big-Stem Jersey 
Yellow Jersey l . 
Gold Skin 2 
Average for all varieties. 
Pounds. 
36.81 
34.61 
36.92 
45.44J. 
45.95 
46.91 
48.00 
43.23 
45. 34 , _ 
50. 2T' 
49.50 
40.73 
44.53 
31- 94__^ 
40. 41 
48.34 
46.39 
45.23 
47.03^ 
44. 7S 
43.94 
31.62 
41.59 
41. 64.- 
47. 97 
45. 15 
44.02 
Per cent 
7.03 
8.44 
8.80 
7.57 
7.05 
7.08 
7.06 
6.75 
6.81 
7.64 
7.98 
9.43 
7.10 
7.89 
7.55 
7.34 
7.50 
6.77 
7.80 
7.10 
8.51 
8.73 
9.62 
6.34 
6.07 
7.11 
10.27 
Percent 
8.15 
10.57 
10.83 
10.50 
9.10 
8.37 
9.08 
8.28 
11.80 
9.73 
10.38 
11.12 
8.87 
9.46 
9.11 
9.33 
9.59 
8.31 
9.44 
8.84 
11.17 
13.35 
12.36 
7.80 
8.06 
8.57 
12. 88 
43.27 
10.20 
Percent 
9.67 
12.05 
12.62 
12.28 
10.86 
9.83 
11.06 
9.60 
13.98 
11.36 
12.24 
12.74 
11.05 
10.92 
10.34 
10.98 
11.25 
9.73 
10.99 
10.38 
13.27 
15.50 
14.11 
9.46 
10.11 
10.19 
14.99 
Per cent. 
10.87 
13.41 
14.52 
14.15 
12.58 
10.98 
12.37 
11.38 
16.01 
12.84 
14.08 
14.66 
13.09 
12.15 
11.51 
12.47 
13.00 
11.43 
12.59 
11.89 
15.59 
18.37 
16.49 
11. 45 
11.90 
12. 03 
17.56 
Per cent. 
11.98 
15.00 
15.58 
15.74 
14.49 
12.13 
13.42 
12.40 
17.73 
14.31 
15.55 
17.01 
14.24 
13.65 
12.69 
13.90 
14.49 
12. 53 
13.93 
13. 03 
17.32 
19.26 
18.22 
12.68 
13.51 
13.49 
19.45 
Percent 
13.15 
16.44 
17.63 
16.81 
15.58 
12.96 
14.46 
12.98 
18.64 
15. 24 
16.89 
17.75 
15.29 
15.47 
13.73 
14.87 
15.43 
13.60 
14.88 
14.09 
18.57 
20.46 
19.86 
14.75 
14. 43 
14.88 
21.01 
Per cent. 
1.08 
.32 
.11 
.35 
.02 
.25 
2.45 
.72 
2.18 
.38 
.13 
.19 
.07 
.40 
.02 
2.64 
1.58 
.34 
.14 
3.65 
1,37 
8.66 
11.99 
13. 82 
15. 31 
16. 52 
Average for only two years. 
8 Average for only three years 
