July i, 1921 
Relation of Length of Kernel to Yield of Corn 
433 
Tabus VII .—Frequency distribution of ears of various weights in the progeny of smooth-, 
medium-, and rough-dented types of corn, 1916-1919 
Year and type. 
Number of ears weighing (in grams)— 
Num¬ 
ber of 
ears. 
Average 
weight* 
0 
to 
50. 
8 S3 
100 
to 
150- 
150 
to 
200. 
200 
to 
250. 
230 
to 
300. 
300 
to 
350- 
350 
to 
400. 
400 
to 
450- 
450 
to 
500. 
1916: 
Gm. 
Smooth. 
14 
37 
36 
68 
90 
105 
74 
22 
2 
504 
257- 1 
28 
62 
66 
95 
89 
68 
9 
459 
252. 6 
Rough. 
4 
37 
31 
37 
72 
106 
107 
54 
19 
2 
469 
261. 5 
1917: 
62 
87 
106 
72 
39 
15 
490 
228. 3 
17 
43 
54 
95 
90 
106 
91 
”3 
47 
11 
506 
233- 5 
48 
67 
92 
42 
19 
530 
239. 8 
1918: 
28 
34 
3 
639 
163. 4 
59 
# 0 
86 
4 
565 
148. 1 
65 
25 
3 
488 
153* 4 
1919: 
23 
182 
173 
49 
7 
705 
202. 4 
4i 
55 
80 
138 
135 
191 
130 
51 
3 
649 
206. 5 
70 
136 
160 
89 
14 
2 
692 
213.6 
Four-year average: 
210. 3 
209. 9 
217. 9 
NUMBER OF ROWS OF KERNELS PER EAR 
The data for number of rows of kernels per ear for the corn used in 
planting the type test were not determined the first season. The results 
for 1917, 1918, 1919, and 1920 are given in Table VIII. The data show 
that the mean number of rows per ear has remained practically sta¬ 
tionary in the medium type, decreased in the smooth type, and increased 
in the rough type. Data for the progeny show similar though somewhat 
smaller differences. 
TablF VIII .—Frquency distribution of ears with various number of rows of kernels 
used for planting type test of Commercial White corn for 1917-1920 
Year and type. 
1917: 
Smooth. 
Medium. 
Rough. 
1918: 
Smooth. 
Medium. 
Rough. 
1919: 
Smooth. 
Medium.. 
Rough. 
1920: 
Smooth. 
Medium. 
Rough. 
Four-year average: 
Smooth. 
Medium. 
Rough. 
Number of ears with- 
14 rows. 
17 
16 rows. 
18 rows. 
Number 
of ears. 
Average 
number 
of rows. 
40 
14. 0 
40 
IS- 4 
40 
16. 0 
26 
13.9 
33 
i 5 - 5 
28 
16. 5 
20 
14.0 
20 
15-3 
20 
17. 0 
40 
14. 1 
40 
15 3 
40 
17. 1 
14. 0 
15 - 4 
16. 7 
