44 Nebraska Agricultural Exp. Station, Research Bui. 11 
2. Seeds planted at customary field rate 
(a) Equal numbers of seed planted in a unit area 
(b) Equal weights of seed planted in a unit area 
(c) Equal volumes of seed planted in a unit area 
III. Manner of selecting seed grades 
1. Hand selection 
2. Fanning mill separation 
3. Specific gravity separation by salt solution 
In the tests which follow, either small nursery test plats or 
large field plats have been employed. All plats have been planted 
approximately at the normal field rate, using equal numbers, 
equal weights, or equal volumes of seed for the various grades. 
The nursery plats have contained either 1 row, 3 rows, or 5 rows 
spaced 10 inches apart. Where plats contained 3 or more rows, 
the 2 outside rows have been discarded, and the yield based upon 
the remaining rows. Thus competition between the various plats 
has been avoided. The length of the nursery plats has been 
either 7 J or 16 feet. The dimensions of the field plats have been 
5.33 feet by 16 rods, making 1/30-acre plats. The nursery plats 
have been replicated from 5 to 10 times each year, while the field 
plats have been replicated 2, 3, or 4 times in recent years, tho 
unduplicated in the earlier years. The character of the plat and 
the number of replications is indicated with each experiment. 
The nursery plats have been planted by hand. A press drill 
was used for seeding the larger field plats. 
RELATION OF SIZE OF SEED TO THE YIELD OF WHEAT WHEN THE VARIOUS 
GRADES ARE PLANTED ALONE IN EQUAL NUMBERS 
The unselected seed of 2 winter wheat and 2 spring wheat 
varieties was compared for yield with large and small seed of the 
respective varieties during 2 years, 1914 and 1915. Five-row 
plats 7 J feet long were used. These were replicated 5 times for 
the winter wheat and 9 times for the spring wheat. The seeds 
were spaced J inch apart, which corresponds to the normal field 
rate. The results are contained in tables 24 and 25. 
As an average for the two varieties of winter wheat, the 
relative seed weights for the unselected, large, and small seed 
were respectively 100, 134.6, and 86.9. The corresponding sprout 
values were 100, 133, and 92.3. The germination for the various 
grades was fairly uniform. For these grades in the order named, 
the relative number of culms were 100, 99.9, and 96.4; the 
relative grain yields were 100, 102.3, and 96.9; the relative 
straw yields were 100, 99.2, and 96.0; and the relative yields of 
total dry matter were 100, 100.4, and 96.2. The grain yields of 
the large seed were 2.3 per cent superior to the unselected seed, 
while the grain yield from the small seed was 3.1 per cent inferior. 
