14 
BULLETIN 1209, U. S. DEPARTMENT OF AGRICULTURE. 
for the crosses being taken from three or more plants in the desired 
row in order more thoroughly to represent the strain as a whole. 
Some additional crosses were made at Burdette, Ark., where the 
same 53 ears were planted in the 1920 breeding plat. There is no 
reason for differentiating between the seed grown in Louisiana and 
in Arkansas. Several ears representing each cross were obtained, 
some of which were discarded because of damage of different kinds. 
The number finally used varied from one to five, as shown in Table 
4 under the heading "Number of seed ears." 
METHOD OF COMPARISON. 
The one to five ears representing each particular cross were shelled 
and mixed together. The productiveness of 41 of these crosses was 
compared at Burdette, Ark., in 1921 in a plat adjacent to the mass- 
selection experiment. Three rows, consisting of a 20-plant row of a 
cross between two 20-plant check plats, constituted a unit. Each 
cross was grown in three or four of these units. The 36 crosses 
replicated three times had these units, end to end, in sections 1, 2, 
and 3, or 4, 5, and 6. The five crosses replicated four times had the 
units adjacent in section 6. The check plats were planted with seed 
of No. 201, check. The order of planting is shown in Table 4. The 
environmental conditions were the same as those described in con- 
nection with the mass-selection experiment. 
Table 4. — Yields of crosses between inbred strains of No. 201 corn at Burdette, Ark., 
in 1921. 
[Explanation.— (1) The number of seed ears noted in column 3 were shelled together lo plain the rows 
indicated. (2) The stand corrections for columns 6, 10, and 14 are made only for those rows for which 
data are given. (:?) Data in columns 6, 7, LO. 11, 14, and 1") for rows having 18 plants or less are calcu- 
lated to full-stand basis. (4) The relative yields (columns 7. 11, 15, and Hi) are computed by hiking 
twice the actual yields divided by the yield's of the two adjacent rows.) 
Sections 1, 2, and \\. 
Section 1. 
Section 2. 
Section 3. 
Seed planted. 
e 
05 
9 
CO 
o 
u 
1 
ft 
S 
Z 
Yield of ears 
per row. 
■/. 
c 
ej 
ft 
o 
he 
M 
s 
s 
Z 
Yield of ears 
per row. 
= 
a 
ft 
"5 
9 
5 
3 
Z 
Yield of ears 
per row. 
Aver- 
age of 
3 repli- 
cations, 
relative 
yield. 
I 
is 
2 
CuiTecteo- 
stand 
basis. 
i 
2 
Corrected- 
stand 
basis. 
I 
!S 
2 
OJ 
■z 
Corrected- 
stand 
basis. 
•s 
o 
2 
E 
*c3 
3 
< 
s 
o 
Is 
3 
< 
> 
2 
3 
I 
5 
6 
7 
P.c. 
8 
19 
20 
20 
20 
20 
20 
10 
20 
L9 
20 
20 
20 
P.. 
20 
20 
20 
21 
19 
9 
Lbs. 
14.4 
10 
Lbs. 
ii 
P.c. 
12 
20 
19 
20 
19 
20 
20 
20 
20 
20 
20 
20 
19 
20 
20 
21 
21 
is 
20 
20 
13 
Lbs. 
14.3 
14 
Lbs. 
IS 
16 
No. 49 
No. W1-. 
Check 
20 
19 
If, 
20 
20 
19 
19 
20 
Pi 
Pi 
2ii 
20 
Is 
20 
is 
17 
20 
20 
20 
Lbs. 
10. 4 
15.8 
11.0 
L8.0 
12.8 
Lbs. 
P.c. 
P.c. 
No. 50 
9-2-X5-1- 
2 
'ii'.h 

93. 2 
14.7 
12.7 
is. l 
14. 2 
uis.:. 
L4.3 
L3 s 
101. s 
101.17 
No. 52 
No. 53 
10-3-X1V 1 
("heck 
:\ 
L36.8 
16.2 
15.7 
109.8 
121.80 
No. 54 
No. 55 
12-1-X3-1- 
2 
11.7 
11. S 
13.0 
11.0 
13. 6 
L3. 1 
10.9 
70.7 
14.4 
12.0 
11.7 
L3.6 
L3. : 
14.0 
12.9 
L2.8 
lo..-> 
'1.0 
9.3 
s .-, 
100.0 
14.9 
15. 7 
94.9 
93. S3 
No. 5« 
No :.: 
13-1-X15 1 
Check 
15-1-X3-1 
( heck 
3 
.... 

"82." 7 
91.4 
'«V;. i 
14.4 
14.0 
17. 1 
14.4 
L6.2 
16. 
11.3 
12. 5 
11.4 
14.2 
13.8 
15.0 

97. 
94.63 
No. 58 
No .7! 
122. 5 
100.53 
No. 60 
No 6] 
2-2-X12 1 
2 
ii ■> 
ins. 1 

PHI. g 
Lot." e 
96. 3 
106.6 
103.67 
No. 62 
3-1-X7-1- 
2 
11.0 
11.2 19- 1 
93.8 
70. 3 
91.30 
No 05 
I 
Check 
1 
12. 1 
ll.ii 
.I'M" 
13.6 
1 1. 2 
102. s 
"i5.\s 
80. 6 
97. 00 
No. (8 
No. 67 
7 1 <15-1- 
Check 
2 
s7.li 
6.4 
9.0 
7;;. I 
S7.0 
82. 67 
