Jan. 12,1924 
Adjusting Yields for Soil Heterogeneity 
83 
“check plats” also constitute replications. The planting arrangement 
to be described was an effort to obtain this result. 
THE METHOD USED 
THE PLANTING ARRANGEMENT 
The planting arrangement was used in connection with corn breeding 
experiments conducted by the Office of Cereal Investigations of the 
United States Department of Agriculture, at Burdette, Ark., in 1921. 
The detailed data have been published, 8 and need not be repeated. It 
should be noted, however, that the field in which this experiment was 
located was so lacking in uniformity that it was used only because of 
circumstances amounting practically to necessity. 
The planting arrangement and methods of computation are indicated 
in Table 1, which gives the order of planting for the first 10 rows of series 
1 to 5. The different lots are referred to by the strain numbers given 
in Table 2. 
Tabus I .—Abstract of data from the comparison of generations in a selection experi¬ 
ment at Burdette , Ark., in IQ 2 I , illustrating the order of planting and the method of com¬ 
puting the percentage yields 
Series 1. 
Series 
2 to 5 
• 
Row 
Actual yields, pounds. 0 
Percentage yields. 
Strain numbers 
m senes: 
No. 
Strain 
number. 
Indi¬ 
2-alter¬ 
3-row 
plats. 
Indi¬ 
2-alter¬ 
3-row 
plats. 
vidual 
rows. 
nate-row 
plats. 
vidual 
rows. 
nate-row 
plats. 
2 
3 
4 
5 
I 
2 
3 
4 
5 
6 
7 
8 
9 
IO 
II 
12 
1 
IO 
0.8 
& 95 - 1 
3-3 
10 
10 
IO 
IO 
2 
I 
14.4 
21.2 
35-6 
692.1 
*>99.7 
2 
3 
4 
5 
3 
I 
11.4 
27.0 
38.4 
89.7 
106.2 
100.7 
1 
1 
1 
1 
4 
I 
12.6 
23.8 
3 6 -4 
99.2 
100.0 
99-7 
2 
3 
4 
5 
5 
2 
12.4 
28.0 
40.4 
hi . 7 
IIO.2 
no.6 
2 
2 
2 
2 
6 
I 
I S *4 
26.5 
41.9 
121.2 
112.2 
ii 5-4 
2 
3 
4 
5 
7 
3 
14.1 
25.6 
39-7 
112.8 
100.7 
104.7 
3 
3 
3 
3 
8 
1 
10.2 
24.0 
34-2 
80.3 
IO4.8 
96.0 
2 
’ 3 
4 
5 
9 
11 
9.9 
20.8 
30-7 
95 *i 
8l.8 
85-7 
11 
11 
11 
11 
IO 
1 
10.6 
20.5 
3 1 • 1 
83-4 
89*5 
87-3 
2 
3 
4 
5 
° On basis of corrected stand. 
6 Not used in correlations as there were no comparable 5-row plats. 
Each strain was grown in a single row between one-row check plats. 
The rows were io hills long with two plants in each hill. A single com¬ 
parison of all of the strains with the alternating check plats constituted a 
series which was replicated io times. A different strain, however, was 
used as the check in each unit. Thus, strain No. i was the check in the 
first unit or series, strain No. 2 was the check in series 2, and so on, each 
of the seed classes, strains 1 to 10, inclusive, being used as a check in one 
of the series. Series Nos. 1 to 5, inclusive, were grown end to end, and 
series 6 to 10 were adjacent to Nos. 1 to 5. A test plat of strain No. 11 
was planted in each of the 10 series, but this strain was not used as a 
check. 
8 Richey, F. D. effects of selection on the yield of a cross between varieties of corn 
U. S. Dept. Agr. Bui. 1209. (In press.) 
