38 Nebraska Agricultural Exp. Station, Research Bui. 11 
crop from each of the two distinct grades at harvest, and it was 
only possible to determine the combined yield when grown in 
competition in the same row. 
Table 19 summarizes the results for all varieties during both 
years. The small seeds weighed 60.3 per cent as much and their 
sprout value was 59.2 per cent as great as for the large seed. 
Practically the same results were obtained from the two grades 
planted in competition as the average results for the two grades 
planted alone. It would appear that if the plants from the small 
seeds were at a disadvantage when grown in competition, those 
from the large seeds must have had an advantage of approximately 
the same magnitude. 
EFFECT OF COMPETITION BETWEEN VARIETIES 
Further information regarding the principle of competition 
between plants was obtained by growing alternate plants of two 
varieties of wheat and comparing the relative results with those 
obtained when the varieties were grown alone. Seed of approx- 
imately the same size were selected for each variety in order to 
eliminate the size of seed as a factor in the competition. Five- 
row nursery plats 7 J feet long were used. The plats within a 
test were systematically distributed and replicated 5 times each 
year for winter wheat and 9 times for spring wheat. The tests 
were duplicated with both large and small seeds. The results 
are given in tables 20 to 23. Because of a seasonal difference in 
the relative behavior of two varieties, the results for each year 
should be considered individually. The behavior of the varieties 
in plats where the seed of each was planted alone shows con- 
clusively that the season had different effects on the varieties in 
different years. 
Results for 191 U — As an average for both the large and small 
seed tests with winter wheat in 1914 (table 20), in which there 
was practically no difference in size or germination of the two 
varieties, the following results obtained : Grown alone, the yields 
of grain, straw, total crop, and number of culms for Big Frame 
were respectively 90, 88, 89, and 80 per cent as large as for the 
Turkey Red. When grown in competition, these Big Frame 
yields were respectively only 55, 70, 67, and 68 per cent as large 
as for the Turkey Red. 
