368 
Journal of Agricultural Research 
Vol. XIV, No. 9 
one of the lowest means for height at second leaf was for plants grown 
on the more productive soil; and likewise one of the highest and one of 
the lowest for plants 
grown from the great¬ 
est mean weight of seed. 
Temperature and mois¬ 
ture conditions appear 
to have had a large in¬ 
fluence in rate of devel¬ 
opment at this early 
soo 
/SO 
* 
V /*?<? 
/oo 
$ 
Ch so 
I 
^ 40 
SO 
A 
A 
l\ 
t/ 
J/ 
j 
/ 
w 
1/ 
' 
1 
1 
IV 
1 
1 
i'll 
\\ 
TIT 
/ 1/ 
/ 
y 
j 
r 
.1 
" 1 
v / 
\ J 
\ 
\ 
“T 
— \- 
t 
1 
/ 
TT 
\ 
- \ 
\ 
-\- 
t 
0 
s 
\J 
\ 1 
40 J'O SO 70 SO SO /OO //O /SO 
AU&PAG/T /A/ C£T/VT/rtFT/E/PS. 
Fig. i.—G raphs showing the frequency distribution of wheat plants 
for average height. 1914-1917. 
stage. 
The means in centi¬ 
meters for height at six 
weeks are 22.523d: 
0.150 m 1914* 2 3- 2 77± 
o.noin 1915,18.515 ± 
0.076 in 1916, and 
15.638io.641 in 1917, 
with no significant dif- 
erence between the first 
two. This is in the 
same order as the means 
for weight of seed 
planted and in practically the same ratio. The indications are that the 
influence of the weight of seed on the height of the plants at the six weeks’ 
period was greater than 
at second leaf. 
The means for height 
of tallest culm at matur¬ 
ity in ascending order of 
magnitudeare87.02i i 
o.389for 1914,91.043 ± 
o. 149 for 1916,98.763 ± 
0.193 for 1917, and 
113.663io.173 for 
I 9 i 5 - 
The means for aver¬ 
age height of culms at 
maturity, average 
length of spikes, num¬ 
ber of kernels, yield 
of kernels, and total 
yield per plant follow 
the same order as those for height of plant. The sequence for aver¬ 
age height of culms and yield of kernels per plant representing the 
/w 
/fid 
h 
l 
1 
1 
\ 
\ 
W 
\ 
\ 
so 
/ 
\i 
\ 
so 
40 
/ 
/ 
{ 
Tr: 
W 
y 
f\ 
1 
/ 1 
\ 
\ 
so 
U 
y 
\ 
y 
\ 
V 
!/ 
X 
\ 
/a 30 30 40 SO so 70 SO so 
r/£LO JM OFC/G/PAMG 
Fig. 2.—Graphs showing the frequency distribution of wheat plants 
for yield of kernels. 1914-1917. 
