C orn In c estimations 
37 
ful groups (3 and 4) proved to be hybrid. Thus it was estab- 
lished that only 0.7 per cent of the kernels of the Nebraska 
White Prize corn were self -fertilized. Natural field pollination 
under our conditions appears to be ver\^ effective in preventing 
self-fertilization. 
Table 11. — Amount of self-fertilization occurring with N ebraska 
White Prize corn plants grown scatteringly in a field of 
Hogue's Yellow Dent corn. 1 1915. 
Classification of kernels 
Per cent kernels 
based on eye 
separation 
Per cent kernels 
after verifying those 
doubtful by planting 
and inbreeding 
Per cent 
Per cent 
Total kernels harvested 
100.00 
Distinctly yellow (hybrid) 
90.40 
. . 
White or faintly yellow — 
Apparently pure white 
1.05 
0.70 
Apparently hybrid 
3.80 
3.80 
Doubtful kernels proved hybrid . . 
4.70 
4.70 
Verified per cent of self-fertilization . . 
0.70 
The initial flowering period of both varieties fell on the same dates. 
EFFECT UPON SEED VALUE OF PREVENTING THE NORMAL AMOUNT OF SELF- 
FERTILIZATION OCCURRING IN A FIELD OF CORN 
During the eight years 1912 to 1917 and 1920 and 1921, a 
comparative yield test was made of Nebraska White Prize seed 
corn which had been produced on detasseled plants as opposed 
to seed from plants not having the tassels removed. In the seed 
plat, planted to ordinary wind fertilized corn, 8 or more alter- 
nating rows were detasseled each year, and the 100 best de- 
veloped ears were saved from both the detasseled and the un- 
detasseled rows to furnish seed for the following year's yield 
test. The test plats consisted of single rows 16 rods in length, 
and were replicated from 6 to 12 times each year. The air-dry 
yields were based upon the first fifty hills, in each row, contain- 
ing 3 plants and surrounded by a normal stand. The results 
are given in Table 12. 
As an average for the eight years, the seed harvested from 
the detasseled rows yielded 48.6 bushels per acre, compared with 
48.3 bushels for the seed from the normal rows. It is evident 
from these data that the amount of self-fertilization which 
