18 
BULLETIN" 1039, IT. S. DEPARTMENT OF AGRICULTURE. 
Table IX. — Yields of Kubanka durum spring wheat grown in rate-of-seeding 
experiments on dry land on the Belle Fourche Experiment Farm in 1909, 
1910, and 1913 to 1917. inclusive. 
Yields per acre (bushels). 
Rate of seeding per acre. 
1909 
1910 
1913 
1914 
1915 
1916 
1917 
Average. 
1909 to 
1917 
1913 to 
1917 
12.5 
5.5 
9.3 
9.8 
10.4 
9.9 
10.3 
10.6 
2. 2 61. 6 
2. i 60. 1 
2. 3 1 61. 4 
2. 59. 2 
2. 57. 4 
11.2 
10.7 
11.2 
10.9 
11.5 
12.4 
12.4 
11.6 
12.3 
12.4 
""16.T 
16.6 
16.2 
19.3 
14.4 
16.8 
17.2 
5. 5 
2.8 
1.8 
19.0 
19.4 
6 pecks 
18.9 
7 pecks 
18.7 
17.9 
3.4 
1.9 
Several interesting facts are brought out by the data shown in 
Table IX: (1) The net yields were not increased by sowing at a 
rate in excess of 3 pecks per acre; (2) thin seeding will not ma- 
terially increase the yields nor prevent failure in dry seasons; and 
(3) thick seeding reduced the yields only slightly below those of the 
medium and thin seedings. 
It has commonly been assumed that durum wheat should be sown 
at the rate of 4 to 5 pecks per acre on dry land, as compared with 
3 pecks of common wheat, because of the large size of the durum 
kernels and also because durum wheat tillers less freely than com- 
mon wheat. Apparently this is offset by other characters of durum 
wheat, such as the large size of spikes and kernels produced. The 
above experiment was always conducted on well-prepared land. On 
a rough seed bed a higher rate of seeding than 3 pecks per acre 
might be necessary. The slight differences in yield shown above 
from the different rates of seeding are not significant. 
In Table X are shown the average number of days from emergence 
to maturity, the average height, weight per bushel, and yields of 
grain and straw of the wheat sown at each rate during the period 
from 1913 to 1917, inclusive. The average stands recorded during 
the years 1915 to 1917, inclusive, in thousands of plants per acre, 
also are shown. 
The proportion of straw to grain was slightly higher in the plats 
sown at the higher rates. The plats sown at 3 pecks per acre ma- 
tured about one day later than the others. In most years it was 
observed that the plats sown at the higher rates matured first, but 
this was not true in all seasons. The wheat from the plats sown at 
6 and 7 pecks per acre was an inch shorter than that on the other 
plats. The weight per bushel of the grain from the thicker sown 
plats is slightly less than from the plats sown at 3 to 4 pecks per 
acre. 
