8 
BULLETIN 1183, U. S. DEPARTMENT OF AGRICULTURE. 
cent in 1917, and the lowest 14.5 per cent in 1918. The samples 
from Chico, Calif., were the lowest in crude protein, averaging only 
8.9 per cent for the five years, while those from Havre, Mont., were 
the highest, averaging 17.5 per cent. That locality had a greater 
effect on the crude protein content than season is evidenced by- 
the fact that the ranges in percentage for the samples from the 
various stations for individual crop years are much higher than 
those between crop years for the individual stations. The aver- 
age yearly range between stations was 9.5 per cent, while the station 
average range between crop years was only 3.3 per cent. 
Table 4. — Annual and average percentage of crude protein in samples of 
Marquis wheat grown at 12 experiment stations in the western United States 
during the five gears from 1917 to 1921, inclusive. 
Station. 
1917 
1918 
1919 
1920 
1921 
Average. 
Range. 
P.ct. 
14.5 
18.6 
16.6 
16.5 
14.8 
17.4 
17.5 
14.1 
16.7 
15.9 
16.7 
11.1 
P. ct. 
15. 7 
14.6 
14.2 
12.5 
14. .5 
14.6 
16.9 
14.3 
16.1 
U5.7 
15.4 
10.0 
P.ct. 
16.8 
17.1 
17.4 
14.9 
15.7 
13.0 
15. 9 
14.5 
14.9 
16.6 
M4.5 
7.5 
P.ct. 
14.8 
19.6 
15.2 
16.1 
14.3 
12.6 
17.5 
14.9 
16.8 
16.4 
116.9 
7.9 
P.ct. 
14.5 
17.6 
19.2 
17.1 
11.9 
11.7 
17.5 
14.6 
14.0 
16.7 
113.1 
7.9 
P.ct. 
15.3 
17.5 
16.5 
15.4 
14.2 
13.9 
17.1 
14.5 
15.7 
16.3 
15.3 
8.9 
P.ct. 
2.3 
5.0 
5.0 
Mandan, N. Dak 
4.6 
Archer, W vo 
3.8 
North Platte, Nebr 
5.7 
Akron, Colo 
1.6 
.8 
2.8 
1.0 
Aberdeen, Idaho 
Chico, Calif 
3.8 
3.6 
Average 
Range 
15.9 
7.5 
14.5 
6.9 
14.9 
9.9 
15.2 
11.7 
14.6 
11.3 
151 
9 5 
3.3 
Grown under irrigation. 
YIELD OF STRAIGHT FLOUR. 
Yields of straight flour obtained from the individual samples of 
Marquis wheat grown in the 60 tests are shown in Table 5. The 
lowest yield of flour obtained from any of the samples of Marquis 
was from a sample grown at Mandan, X. Dak., in 1921, when only 
60.2 per cent of flour was obtained. The highest yield was from a 
sample grown at Chico, Calif., in 1918, which yielded 76.2 per cent. 
The 60 samples gave an average yield of 70.3 per cent flour. In 
1918, samples from the 12 stations produced the highest yield with 
an average of 72.3 per cent flour. The lowest average for the 12 
stations was from the 1921 crop, with a yield of 69 per cent. The 
highest average flour yield from any station was obtained from sam- 
ples from Aberdeen, Idaho, which was 73.7 per cent for the five-year 
period. During the three years 1919 to 1921, inclusive, these samples 
were grown under irrigation. Samples from North Platte, Nebr., 
produced the lowest average yield of flour, being 68.2 per cent for 
the five-year period. The greatest range in flour yield between crop 
years for any of the stations was 15.3 per cent for Mandan, N. Dak., 
and the greatest range between stations for any crop year was 14.9 
per cent. These figures indicate that both locality and season have 
an influence on flour yield, but the extent of this influence is difficult 
to determine because of the high experimental error to which the 
test may be subjected, and because of the relationship existing 
between test weight per bushel and flour yield. 
