8 BULLETIN 1396, U. S. DEPARTMENT OF AGRICULTURE 
seed of Sacaton June corn. In all instances the seed was from the 
1923 plantings. Comparisons were made by grouping the seed 
stocks into pairs and planting the members of each pair in alternate 
rows, repeating as often as the quantity of seed would permit. 
Sample pedigrees of the various seed stocks grown in 1924 are shown 
in Figures 3 to 6. 
The field in which the yield test was made is divided into irriga- 
tion borders 400 feet long by 25 feet wide. The borders are separated 
by ridges of soil, but within each border the ground is kept as level 
as may be except for the slight and uniform drop along the length 
of the border. The plantings were made in rows running the long 
way of the border and 3% feet apart. The plants in the row were 
about 2 feet apart, making approximately 200 plants to the row. 
Each border of seven rows and with an area of one-fourth acre was 
considered an independent experiment in which the yields of two 
seed stocks were compared. 
The arrangement of the comparisons made in 1924 is shown in 
Table 3. There was a pronounced and rather uniform decline in 
fertility in passing from border 1 to border 8, as shown in the yield 
of crib-selected seed which was planted in all borders as outside 
rows. 
For this reason the actual yields in different parts of the field may 
not be compared, and it will be best to consider the individual com- 
parisons as separate experiments. Five seed stocks are involved, 
and there are six of the comparisons. 
TABLE 3.—Arrangement of seed stocks of maize in comparisons of yield in 1924 
Bor- Bor- 
der aed Seed stock der moe Seed stock 
No. : No. ; 
1 | Crib selected. 29 | Crib selected. 
2 | Crossbred. 30 | Crossbred. 
3 | Self Fo. 31 | Self Fj. 
Tl eae 4 | Crossbred. Cece 32 | Crossbred. 
5 | Self Fo. 33 | Self Fy. 
6 | Crossbred. 34 | Crossbred. 
7 | Crib selected. 35 | Crib selected. 
8 | Crib selected. '( 36 | Crib selected. 
9 | Crossbred. 37 | Crossbred. 
10 | Self F4. 38 | Self Fy. 
yee 11 | Crossbred. Gece 39 | Crossbred. 
12 | Self Fs. || 40 | Self Fy. 
13 | Crossbred. 41 | Crossbred. 
14 | Crib selected. || 42 | Crib selected. 
15 | Crib selected. 43 | Crib selected. 
16 | Crossbred. 44 | Self Fi. 
17 | Crib selected. |} 45 | Self Fe. 
Os 18 | Crossbred. PP vl as 46 | Self Fy. 
19 | Crib selected. \| 47 | Self Fe. 
20 | Crossbred. lj 48 | Self Fi. 
21 | Crib selected. ‘| 49 | Crib selected. 
22 | Crib selected. 50 | Crib selected. 
23 Do. 51 | Self Fi. 
24 | Crossbred. 52 | Crib selected. 
eee 25 | Crib selected. Ba Ne a, 53 | Self Fi. 
26 | Crossbred. 54 | Crib selected. 
27 | Crib selected. 55 | Self F:. 
28 Do. | 56 | Crib selected. 
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