SMALL GKAINS ON ARLINGTON EXPERIMENT FARM 
15 
It appears that there is either a varietal difference in seeding re- 
quirements or else long-time experiments are necessary to overcome 
the effect of the experimental error. 
Table 9 shows the average yields of grain and straw and the bushel 
weights obtained from different seeding rates with Purplestraw 
wheat (C. I. No. 1915) for the 5-year period, 1919-1923, inclusive. 
Yields of straw as well as grain increased at the higher rates of seeding. 
The higher bushel weight at the 4-peck rate can not be explained. 
Ratios of straw yields to grain yields also are shown. 
Table 9. — Average yields and other data for P urplestraiv wheat grown in rate-of- 
seeding experiments at the Arlington Experiment Farm in the 5-year period, 1919- 
1923, inclusive 
Seeding rate 
2 pecks 
3 pecks 
4 pecks 
5 pecks 
6 pecks 
7 pecks 
8 pecks 
Average acre 
yields 
Ratio of 
grain to 
straw 
•Grain 
Straw 
Bushels 
Pounds 
22. 5 
3,155 
1:2. 34 
25.2 
3, 530 
1:2.33 
26.1 
3,669 
1:2.34 
26.7 
3,812 
1:2.38 
27.5 
3,790 
1:2.30 
27.3 
3,869 
1:2.36 
28.0 
3,872 
1:2. 30 
BuShel 
weight 
Pounds 
58.9 
58.8 
69.5 
59. 2 
59.1 
59.1 
59.2 
SPRING WHEAT 
Spring-sown wheat can not be grown profitably in the vicinity of 
Washington, D. C. Experiments with wheat seeded during March 
and April show that the crop does not possess sufficient vigor to 
combat weeds, rust, and adverse weather conditions, which often 
occur in this locality. In 1911 and 1912 attempts to grow spring- 
sown wheat resulted in the production of a few scattered heads each 
year. During the period from 1915 to 1918, inclusive, Marquis 
wheat was spring sown either in twentieth-acre or fortieth-acre plats. 
Yields of Marquis and of fall-sown Purplestraw wheat (C. I. No. 
1915) are shown in Table 10. In each of the four years the crop of 
spring wheat was poor, the 4-year average yield being 6 bushels, as 
compared with 35.9 bushels from the fall-sown variety. 
Table 10. — Yields of spring-sown Marquis and fall-sown Purplestraw wheats 
grown at the Arlington Experiment Farm. 1915-1918, inclusive 
Variety 
Marquis, spring sown. 
Purplestraw, fall so\vn_ 
Acre yields (bushels) 
915 
1916 
1917 
1918 
7.3 
31.4 
4.2 
23.1 
1. 1 
52.7 
11.2 
36.3 
Aver- 
6.0 
35.9 
