34 BrrLLETIX U. S. DEPARTMENT OF AGRICULTUEE. 
section, as in the first, six plats were seeded each year, representing 
as many different rates. The stands obtained from the same rate were 
not the same in all years. The stands in the thick rate range from 
about 2 to 5 inches of row space to the plant in the different years, 
while the thinner stands in some years have a much wider range. 
The various spacings between plants in rows 7 feet apart have an 
influence on suckermg similar to those in rows 3^ feet apart, the per- 
centage increasing as the stand decreases. In 1918 the thick stand 
produced no suckers, but the percentage increased in the thinner rates 
up to 26 per cent in the lo-inch stand. The percentage of suckers was 
much higher in other years, but it usually showed the same general 
trend between the thin and thick rates. 
The good seasons show a high percentage of stalks bearing heads, 
but in these seasons, as in the poor ones, the thinner plantings show a 
higher percentage than the thicker ones. The lowest percentage in 
all the rates was produced in 1918 and the highest in 1919. 
The total crop yields in the 7-foot rows do not run as high as in the 
corresponding spacings with the rows spaced 3^ feet apart. The 
highest total crop yield, 8,500 pounds, in this 6-year period, was made 
by the 3-inch spacing in 1915, and the lowest by the 6-inch spacing in 
1918. The high grain yields do not in all cases follow the high total 
crop yields. In 1915 the spacing that ranked second in total crop 
yield had first place in grain yield. In 1916 and 1918 the spacings 
given third place in total crop yield took first place in grain yields. 
The grain yields were higher from all rates in 1915 than in any other 
year. 
Table XVIII. — Annual and average yields of Dawn hafir in roivs spaced 7 feet apart in 
the spacing experiments at the Amarillo Cereal Field Station during the 6-year period 
from 1914 to 1919, inclusive. 
[In the statement of yields per acre the bushel is rated at 60 pounds.] 
Row space per 
plant. 
Annual jields per acre. 
Average yields per acre. 
1914 
1915 
1916 
1917 
1918 
1919 
4 years, 
1915 to 
1918. 
5 years, 
1914 to 
1916, 
1918, 
1919. 
5 years, 
1915 to 
1919. 
6 years, 
1914 to 
1919. 
2 to 3 inches 
Bush. 
Bush. 
47.7 
48.0 
49.7 
4:3.8 
40.8 
Bush. 
1. 7 
8.5 
10.7 
5.3 
6.2 
Bush. 
17.7 
21.7 
Bush. 
1.9 
3.0 
1.2 
3.0 
1.2 
Bush. 
Bush. 
17.3 
20.3 
Bush. 
Bush. 
Bush. 
4 to 5 inches 
6 inches 
25.0 
23. 5 
18.2 
37. 1 
31. 5 
27.3 
23.7 
24. 3 
2.3.3 
19.5 
2.3.7 
""22.'6' 
19.5 
23.9 
"'"2i."9 
8 to 9 inches 
10 to 15 inches 
3.3.8 
25. 5 
21.5 
18.4 
Table XYIII shows the annual and average acre yields in bushels 
of 60 pounds each for five rates in part or all of the 6-year period from 
1914 to 1919, inclusive. The thick rate had a stand ranging from 2 
to 3 inches of row space to the plant in the four years for which data 
are shown. The second rate, with 4 to 5 inches of row space to the 
