Table IV .—Leaf development of the different type classes of 2-year-old seedlings 
UNTREATED WESTERN YELLOW PINE® 
May 2,i92x Effect of Ferrous Sulphate on Chlorosis of Conifers 167 
f© 
i 
•g 
Total. 
O 00 » 0 >O M H 
O 
H 
1 
1 
1 
Second¬ 
ary 
leaves. 
Q « « O M 
O V •»} Cl M M 
H 
i 
Primary 
leaves. 
O W W 
0 0 r» in'© v 
Average 
total 
leaf 
surface 
per 
plant. 
. »ovo uvo «/> Ov 
2^ h »o »o «*} ti 
Sg H 
* 0-5 
Average 
leaf 
surface 
per 
plant. 
Square 
inches. 
7.89 
3-34 
2.52 
2.08 
1-37 
.88 
1 
jj 
Average 
thick¬ 
ness. 
. «5 vnnioNw* 
f« M M M M H 
$>0 0 0 0 0 0 
3 d . 
3 
1 
a> 
W 
Average 
length. 
Inches. 
2. 61 
1.82 
1. 63 
i- 45 
1.09 
1.05 
Average 
number 
per 
plant. 
H OiN N 
t$ Os to rooo 
'O (1 (4 H H 
Percent¬ 
age of 
seedlings 
bearing 
second¬ 
ary 
leaves. 
89 
66 
001 
001 
001 
i 
Average 
leaf 
surface 
per 
plant. 
w . r» « « t-* 00 h 
2 | « « M « H 
5-8 
1 
Average 
thick¬ 
ness. 
. 'O « -t N 5 fO 
2 0 0 0 0 0 0 
l d . 
Average 
length. 
• o 
«<l O 00 00 00 VO V© 
*•». 
Average 
number 
per 
plant. 
*^00 « (1 Tf H 
NH VO 00 
n V V rt t*> 
Number 
of 
seedlings. 
OO X 
ZOI 
OOI 
ZZ 
OOI 
OOI 
Type class: 
! 
Vigorous, green... 
Vigorous, slightly chlorotic. 
Vigorous, strongly chlorotic. 
Weak, green. 
Weak, slightly chlorotic. 
Weak, strongly chlorotic. 
e 
g 
