EXPERIMENTS WITH FLAX OX BREAKING. 
21 
RATEOF-SEEDING EXPERIMENTS. 
When seed flax sells at $4 or more per bushel, the importance of the 
economical use of seed is apparent. Table VII shows the annual 
and 3-year average yields of flax when different rates of seeding 
were used. In these experiments, seedings at the rate of 20 pounds to 
the acre produced the best average yields in the three years. When 
the probable errors of these results are considered, practically no 
significant differences are indicated except in one or two of the 
yearly averages. While 10 pounds to the acre is probably too light 
a seeding, little advantage seems to be gained by seeding at a heavier 
rate than 20 pounds under semiarid conditions. Of course, if the 
seed bed is poorly prepared, more seed will be necessary to insure 
adequate seeding. 
Table VII. — Annual and average yields obtained in the rate-of-seeding experiments 
with Reserve (C. i". No. 19) flax at JIandan, N. Dak., for the years 1914, 1915, and 
1916. 
Rate of seeding. 
Yield per acre (bushels). 
1914 
Average. 
10 pounds per acre i 14. 6±0. 8 
15 pounds per acre j 15. 1±3. 
20 pounds per acre ' 14. 3± 2. 4 
25 pounds per acre .... 14. 1±0. 8 
30 pounds per acre 
22. 5±0.8 
24.0±1.3 
25.4±0 
24.1 ±0.5 
14.7±0.8 
14.6±0.5 
16.0±0.2 
15.9±0.8 
16.7±0.3 
17.3±0.S 
17.9±1.9 
18.6±1.4 
18.0±0.7 
DATE-OF-SEEDING EXPERIMENTS. 
The marked similarity in the three seasons here reported dis- 
credits to a large extent a date-of -seeding experiment continued for 
so short a period. Kesults so far obtained, as given hi Table VIII, 
indicate an advantage for early seeding on new breaking in this area. 
Table VIII. — Annual and average yields obtained in the date-of-seeding experiments 
with Damont (C. I. No. S) flax at Mandan, N. Dak., for the years 1914. 1915. and 1916. 
Yield per acre (bushels. 
Date of seeding. 
1914 
1915 
1916 
Average. 
16.6 
22.0±0.2 
18.8±0. 7 
19. 1±0.5 
15.2±0.2 
17.6±1. 1 
19. 1±0. 6 
17. 1±0. 5 
10. 1±0.3 
15.9 
17.6±0.2 
18.3±0. 1 
12.3±0. 2 
19. 1±0. 7 
May 15 to 18.... 
18.7±.05 
Junel 

16.2±0.7 
Seedings made as early as April 15 possibly are subjected more or 
less to late frosts, which reduce stands. Seeding should not be delayed 
after May 1, however, where the land is in condition. Figure 2 
shows the relative appearance of Damont flax on July 17, 1914, 
seeded on May 15 and June 1, respectively. The May 15 seeding 
