PRODUCTIVENESS OF SELF-FERTILIZED CORN 3 
The number of replications ranged from 10 to 20, depending 
upon the quantity of seed available, the number in each case being 
given in column 11 of Table 2. Each unit was separated from the 
adjacent ones by check plats of open-fertilized No. 201, seed for 
which was obtained from the Burdette Plantation, Burdette, Ark. 
Table 1. — Order of planting the crosses between the 3-1- and 5-1- families of No. 
201 corn {index Nos. Ifl—Ifl) and accompanying check rows in field rows Nos. 
103 to 115 
^The rows were divided into 9 plats of 10 hills each. The number shown for each plat is the index number 
of the lot of seed grown in that plat. C indicates a check plat] 
Rows divided into 9 sections of 10 hills 
Rows divided into 9 sections of 10 hills 
each 
each 
Field row 
Field row 
1 
2 
3 
4 
5 
6 
7 
8 
9 
1 
2 
3 
4 
5 
6 
7 
8 
9 
No. 103.... 
C 
C 
C 
C 
C 
O 
C 
C 
C 
No. 110.... 
42 
45 
42 
43 
46 
44 
42 
44 
45 
No. 104..... 
42 
44 
46 
42 
44 
46 
42 
44 
46 
No. Ill 
43 
46 
43 
45 
43 
45 
46 
45 
46 
No. 105.... 
43 
45 
47 
43 
45 
47 
43 
45 
47 
No. 112.... 
44 
47 
44 
42 
44 
42 
44 
46 
44 
No. 106.... 
44 
46 
42 
44 
46 
42 
44 
46 
42 
No. 113.... 
45 
44 
45 
46 
45 
43 
45 
43 
42 
No. 107.... 
45 
47 
43 
45 
47 
43 
45 
47 
43 
No. 114.... 
46 
43 
46 
44 
42 
46 
43 
47 
43 
No. 108.... 
46 
42 
44 
46 
42 
44 
46 
42 
44 
No. 115.... 
O 

G 

(3 

O 
C 

No. 109.... 
47 
43 
45 
47 
43 
45 
47 
43 
45 
Heavy rains shortly after emergence packed the soil and caused 
severe erosion in places. Storms about tasseling time also damaged 
the plants. These conditions tended to decrease the stand and to 
increase the proportion of barren plants. It is believed, however, 
that the distribution of the replications was such that comparisons 
among the selfed lines or crosses in any unit are accurate within the 
limits of their probable errors. On the other hand, close comparisons 
can not be made safely between the crosses and their parents or 
between the selfed lines or crosses in different units. 
Sample lots of ears, consisting of the total product of one replicate 
of each line and cross, were saved at harvest, dried, and shelled. 
/The harvest weights were computed to terms of air-dry shelled corn 
on the basis of these data. The drying and shelling samples for the 
3-1- and 5-1- lines and for the cross 3-1- X 5-1- are shown in 
Plate I. 
EXPERIMENTAL DATA 
A summary of the experimental data for each selfed line and cross 
is given in Table 2. Most of the data are self-explanatory. The 
relations between the lines are shown by the pedigree numbers in the 
tables. In these, each number separated from the others by a dash 
(-) represents one generation of selection and self-fertilization. The 
letter S at the end of a pedigree represents the extra generation of 
self-fertilization in 1921 in obtaining seed for the comparisons. The 
average height of plants (column 5) is the arithmetic mean of the 
estimated heights in the different replications. All other records 
are based on actual determinations. The data on adjacent check 
plats in columns 15 and 16 give an idea of the relative productiveness 
of the different parts of the field. Two rows of nine check plats each 
were grown between the units of the crosses, and only one row was 
grown between the units of the self-fertilized lines. Excess checks 
also were used to fill in when the number of plats needed for any 
comparison failed to equal the number of plats available in a unit. 
This accounts for the inequality in the numbers of check plats 
adjacent to the different units. 
