1 \)'I’A'J'0 I N ^■ES1'1GA'I’ lOJs’ S 
21 
and shrinking' of tlie tubers due to the fact that it was necessary 
to keep the room in Avhich they were stored during the greening 
process, heated to prevent freezing. 
Aside from conclusions which may be drawn from experimental 
results, fall greening is believed to be impractical under the con- 
ditions which obtain in this locality. Practically all of the seed 
used by the growers is either jDicked out from the main crop during 
the winter at the time of sorting or is bought in the spring so that 
the seed is not available in the fall for greening at that time. The 
, low night temperatures in the fall after the late varieties are dug 
would necessitate the transfer of the potatoes to the storage house 
each night or specially constructed buildings would need to be pro- 
vided to prevent freezing and at the same time admit sufficient 
: light for greening. The short daily period of sunlight of relatively 
low intensity at that time of the year would greatly prolong the 
period required for thoro greening. 
The seed greened in spring produced a larger yield than the 
ungreened seed in each of the three years of the experiment. The 
I increases in 1917 and 1918, however, were so small as to be scarcely 
significant from the practical standpoint tho they are very con- 
sistent. In 1916, when the effect of greening was most pronounced, 
the plants from the greened seed came up about two days earlier 
than those from the ungreened seed and produced a more vigorous 
growth of vines during the early stages of growth-. This difference 
TABLE 9 
Comparison of Yields from Greened and Ungreened Seed. 
TREATMENT OF SEED 
Crop of 1916 
(bushels) 
Crop of 191 
7 (bu-shels) 
Crop of 1918 (bushels) 
Yield 
per acre 
Increase or 
decrease ( — 
Yield Increase or 
) per acre decrease ( — ) 
Yield Increase or 
per acre decrease ( — ) 
Check — seed 
not greened... 
426.0 
Seed g-reened 
in fall 
407.1 
—6.1 
Check — seed 
not greened . . . 
337.9 
400.3 
352.5 
Seed greened 
in spring 
371.7 
24.8 
407.6 
2.6 
351.5 
4.5 
Check — seed 
not greened... 
355.8 
409.6 
341.4 
Seed greened 
in fall 
403.3 
— 5.1 
Check — seed 
not greened . . . 
407.1 
1 Seed greened 
in spring 
382.8 
31.2 
417.5 
3.9 
342.9 
2.1 
Check — seed 
not greened . . . 
347.0 
420.0 
340.2 
Average increase resulting from spring 
greening 
28.0 
3.3 
3.3 
Average decrease resulting from fall 
greening 
—5.6 
