6 BULLETIN 13*7, IT. S. DEPARTMENT OF AGRICULTURE. 
The tillering in most varieties is not completed as rapidly as is the 
production of the fourth leaf, and it is deterred by disease much 
more than is the leaf. 
92 
aa 
84 
eo 
76 
72 
68 
&? 
60 
56 
52 
j 
-^-* 
^ 
/ 
> ___ 
-■**" 
/ 
**' 
f 
S 
i 
y 
_ 
^ 
/ 
^ 
/ 
/ 
/ 
/ 
/ 
/ 
r-" 
/ 
/ 
i 
/ 
/ 
/ 
n f 
/ 
/ 
/ 
it 
/ 
u 
OV 
' 
— 4— 
/ 
if/ 
kl 
"^ 
H 
W 
& 
°£ n 
\ 
H 
if- 
<_ 
-M 
*/ 
St 
w~ 
"n 
o7 
fir 
a/ i 
/ 
.'6 
/S 
8 
4- 
o 
1 
v / 
ft / 
,q/ 
zzJe/ 
T- 
y/ 
/ 
/ 
~r 
7 
_ 
h 
1232425 26 27 28 29 3Q 3/j ./ 
/O // /2 /3 /*. 
Fig. l. 
-Curves showing the production of the second, third, and fourth leaves and of the 
first tiller in 96 plants of Oderbrucker barley (selection No. 50). 
Besides the difference in dates there is a difference in method of 
production. In some varieties the curve of each stage is very acute 
and the stage is completed in a few days. In others it is more obtuse 
4T" 
I 
1 
r 
'7 
6 
4 
3 
2 
1 
'3.' 
30 
29 
sa 
27 
26 
K i 
\ 
ho 
* 
\ 
/ 
\ 
/ 
\ 
i 
\ 
r 
\ 
y 
\ 
\ 
/ 
\ 
r 
\ 
/ 
\ 
s 
** 
\ 
/ 
\ 
\ 
i 
<f> 
f 
\ 
— 
{ 
\ 
1 
\ 
< 
r 
\ 
/ 
5 
i 
\ 
! 
1 
\ 
\ 
\ 
/ 
N 
\ 
/ 
, 5 
\i 
t£A 
s 
1 
\ 
V 
i 
\ 
\ 
\ 
r" 
\ 
/ 
\ 
f 
\ 
/ 
\ 
/ 
s 
/ 
\ 
/ 
|J 
1 
IK 
Jkf 
•«* 
ve 
/ 2 
3 
? 2 
. 
~ 1 
7 * 
T70HI 
2 
8 3 
^3£ 
- 2 
9 1 
1 3 
J 3 
//VJ 
f 3 
i 
3 
B JD 
Fig. 2. — Curves showing varietal differences in 
the rapidity of tillering of barley selections. 
In Eagle (No. 13) all plants produce tillers 
almost simultaneously, while in Russian (No. 
21) the process is extended over many days. 
Fig. 3. — Curves showing the average date 
of the production of the second and 
third leaves and of the first tiller in 100 
plants of each of 17 selections of barley 
grown in drill rows. 
and the time for completion extended. Figure 2 shows the relative 
rapidity of stooling in two selections, the one of the first type and 
the other of the second. 
