32 BITXETIX 976, U. S. DEPAETMEXT C>F AGEICEXTUEE. 
G-iiich spacing to 65.3 per cent in the IS-inch spacing. The maxi- 
mum, 72.7 per cent, was produced in 1917 from a stand of 32.7 
inches of row space to the plant. A low percentage of suckers was 
produced by all rates of seeding in 191S. 
The nmnber of stalks bearino: heads varies widely between the 
spacings in some seasons. The number or percentage of headed 
stalks usually increases as the stands decrease. This is especially 
true for the poor seasons of 1916. 1917. and 191S. 
The best total crop yields were produced in 1915. and the poorest 
in 191S. The highest yield. 11,710 pounds, was from the 6-inch spac- 
ing in 1915. and the lowest. l.OSO pounds, from the 12-inch spacing in 
191S. The highest grain yield does not always accompanv the iiigh- 
est total crop yield. Seasonal conditions at and foil owing heading 
largely govern the grain yield. Favorable seasons are conducive to 
high grain yields from thick stands, while thin stands have the advan- 
tage iu imfavorable seasons. In the favorable season of 1915 the 
highest grain vield was from a stand having S.S inches of row space 
to the plant. In the poor seasons of 1916. 1917. and 19 IS the highest 
yields were produced by stands with 6 to 7 inches of row space to the 
plant. A study of the average yields for a series of years is essential 
to determine the rate which will give the best results imder average 
conditions. These -are presented in Table XAT. 
Table — Aivnual and average yields of JJau n hajir in rows spaced 3h feet apart in 
the spacing experiments at the Ammilla Cereal Field Station during the 6-year period 
from 1914 to 1919. inclusiie. 
Pn the statemerit of yields per acre the bushel is rated ai 60 pounds.] 
Eow space per plant. 
Tields -p&[ acre. 
Average yields jjer acre. 
1914 
1915 
1916 
1917 
1918 
1919 
3 years, 
1915. 
1917, 
and 
1919. 
4 years. 
191.5 to 
191S. 
5 years, 
1914, 
1915, 
and 
1917 to 
1919. 
5 years. 
1914 to 
1916. 
191S, 
1919. 
6 Tears. 
1914 rc 
1919. 
'6 to 7 inches 
Bu. 
S. 7 
IS- 5 
IS. 7 
19.0 
Bu. 
60.2 
69.0 
6S. 3 
62. 7 
DO. 5 
1.0 
Bu. 
14.8 
12. 2 
Bu. 
0.7 
Bu. 
dS.S 
2-5. 4 
Bush. 
37.9 
35. 5 
Bush. 
19.2 
Bush. 
24.6 
25. 4 
Bush. 
21.9 
Bush. 
20.7 
8to 10 inches 
lltolSinches 
•5. S 
3. S 
'23.'2 
15tol9inches 
21 to 26 inches 
37. > 
37.3 
21.9 
27. 1 
The annual and average acre yields from the six spacings are shown 
in Table X^l. The first or thick rate has a stand in the different 
years with 6 to 7 inches of row space to the plant. The second rate 
has a stand with S to 10 inches of row space to the plant. This rate 
is omitted in 1916. and the 11 to 12 inch stand is missing in 1917. 
The 15 to 19 inch stand continued through the 6-year period, but the 
21 to 26 inch stand obtains only in three years. In order to get com- 
parisons of all rates it is necessary to strike averages for a 3-year, a 
4-year, two 5-year, and a 6-year period. In the 3-year average. 
