6 BULLETIN 1157, U. S. DEPARTMENT OF AGRICULTURE. 
made a greater relative gain in yield per plant four times, in the 
weight of ear seven times, and in the number of ears per plant once. 
Table 1. — Influence of spacing on yield, weight of ear, and number of ears per plant in 
single-ear and prolific types of corn 1 grown at Clarksdale, Miss., in 1917 and 1918. 
Number of 
plants per 
row. 
Weight of dry ear corn 
(pounds). 
Area occupied 
per plant 
(square feet). 
Yield. 
Average per 
ear. 
Number of 
ears per 
plant. 
Number of 
suckers per 
plant. 
Year. 
Per row. 
Per plant. 
Single 
ear. 
Pro- 
lific. 
3.97 
6.36 
7.96 
12.06 
13.69 
6.15 
7.72 
10.37 
17.28 
Single Pro- 
ear, lific. 
Single Pro- Single Pro- 
ear, lific. ear. lific. 
Single 
ear. 
Pro- 
lific. 
Single 
ear. 
1 
Pro- Single Pro- 
lific, ear. lific. 
1917.. 
1918.. 
f 4.04 
6.06 
{ 8.30 
11.73 
113. 45 
f 6.05 
I 7.72 
ill. 00 
1 17. 28 
203 207 
135 129 
99 103 
70 68 
61 60 
60 59 
47 47 
33 35 
21 21 
71.2 88.2 0.351 0.426 
74.8 84. S .554 .657 
73. 6 88. . 743 , . 854 
58. 2 76. 4 . 831 < 1. 124 
44. 2 60. 6 . 725 1. 010 
16. 23. 2 . 267 i . 393 
16. C 20. 6 . 340 ! . 438 
14.(1 26.4 .424 .754 
15. 17. 6 . 715 838 
0.419 
.562 
.657 
.693 
.691 
.348 
.400 
.438 
.469 
0.434 
.511 
.515 
.616 
.594 
.318 
.312 
.383 
.400 
0.84 
.99 
1.13 
1.20 
1.05 
.767 
.851 
.970 
1.524 
0.98 0.03 0.11 
1.29 .06 .22 
1.66 .37 1 .36 
1.82 .14 .25 
1.7C .06 .18 
1. 236 . 08 
1. 404 .04 .13 
1.971 .15 .57 
2.095 .86 1.81 
i The varieties used in 1917 were, U. S. Selection 120 (single ear) and Cocke (prolific); in 1918, Singleton 
(single ear) and Arlington (prolific). 
The data obtained from the experiment conducted at Waco, Tex., 
are shown in Table 2. Owing to a severe drought, the yields in this 
plat were negligible. The tabulated results are of interest chiefly 
because they show that under these adverse conditions the small- 
eared prolific type produced more efficiently and actually made 
heavier ears than the single-ear type. 
Table 2. — Influence of spacing on yield, weight of ear, and number of ears per plant in 
single-ear (Singleton < and prolific (Arlington) types of corn grown at Waco, Tex., in 
1918. 
Weight of dry ear corn (pounds). 
Area occupied 
per plant 
(square feet). 
Number of 
plants per 
row. 
Yield. 
Average 
per ear. 
Number of 
ears per 
plant. 
Number of 
suckers 
per plant. 
Year. 
Per row. 
Per plant. 
Single 
ear. 
Pro- Single 
lific. tar. 
Pro- 
lific. 
Single 
ear. 
Pro- 
lific. 
Single 
ear. 
Pro- 
lific. 
Single 
ear. 
Pro- 
inc. 
Single 
ear. 
Pro- 
lific. 
Single 
ear. 
Pro- 
lific. 
1918... 
f 3.45 
J 6.43 
i 10. 50 
1 15. 75 
3.2s 
7.00 
10.85 
15.00 
91 
49 
30 
20 
96 
45 
29 
21 
0.6 
4.0 
4.6 
2.6 
1.2 
4.0 
7.2 
7. 2 
0.007 
.0S2 
.153 
.130 
0.012 
.086 
.248 
.343 
0.067 
.143 
.184 
. 144 
0. 085 
.143 
.218 
. 257 
0.099 
.572 
.834 
.900 
0.146 
.622 
1.138 
1.334 
"6.'02" 
.03 
.05 

0.04 


In Table 3 are recorded the data from the experiments conducted 
at San Antonio. Tex., in 1918, 1919. and 1920. The prolific out- 
yielded the single-ear variety in 14 out of 16 comparisons. A com- 
parison of the two varieties as to relative gains as the spacing 
increased, based on the results obtained at the closest spacing in each 
experiment, show that in 13 comparisons the single-ear type made 
greater gains once in yield per plant, seven times in the weight of 
ear, and four times in the number of ears per plant. 
