76 Nebraska Agricultural Exp. Station, Research Bui. IS 
Table 35 — Ohio state and Pike County yields of corn averaged 
for the same periods as given in Circular of the office of 
Corn Investigations, August 20, 19 lU 
Average for 
first seven 
years, 1901- 
1907 inclusive 
Average for 
second seven 
years, 1907- 
1913 inclusive 
Ratio first 
period to 
second period 
Average 
yield for 
nine years 
previous to 
first period 
Yield per acre for 
state of Ohio as 
compiled from U. 
S. Yearbook 
Bushels 
34.4 
28.7 
Bushels 
38.3 
31.4 
100:111.4 
100:109.4 
Bushels 
32.8 
Yield per acre for 
Pike County, Ohio, 
as compiled from 
the reports of the 
Ohio State Board 
of Agriculture 
able climatic conditions may have been the cause of the appar- 
ent improvement of the ear-to-row corn. 
A similar method of measuring improvement by ear-to- 
row corn breeding at the Nebraska Experiment Station dur- 
ing the same period of 13 years, gives the results shown in 
Table 36. The yield of continuous ear-to-row breeding 
strains during the seven-year period 1907-1913 was 61 per 
cent as great as during the preceding seven years. It would 
appear that the corn yield had been reduced 39 per cent by 
ear-to-row breeding during the last seven years. However, 
a comparison of yields in Lancaster County, in which the 
Station is located, shows a decreased yield of 30 per cent, 
and the State as a whole a decreased yiela of 17.3 per cent 
for the same two periods. Further, the yield of the original 
unselected Hogue's Yellow Dent corn showed a decreased 
yield of 35 per cent at the Experiment Station during the 
second seven-year period. All indications are that the reduced 
yield of ear-to-row corn at the Experiment Station was due 
to climatic conditions and not to the breeding. An actual 
comparison of the ear-to-row corn during the last period of 
seven years with the original corn of the same variety 
planted each year as a check indicates an actual increased 
yield of 5.4 per cent due to breeding, whereas the other 
method of comparison indicated a decreased yield of 39 per 
cent. 
