MANGANESE CHLOROSIS OF PINEAPPLE. 
,19 
Table 12. — Comparative weights of rice plants which were grown in manganous 
sulphate and manganese dioxid solutions to which were added various amounts 
of iron as ferric chlorid. . 
Culture solutions with 
amount of added ma- 
terial per liter. 
Flask 
No. 
Green 
weight 
of 
stalks 
and 
leaves. 
Oven- 
dry 
weight 
of 
stalks 
and 
leaves. 
Oven- 
dry 
weight 
of 
roots. 
Average oven- 
dry weight. 
leaves. P lant - 
Condition of plants. 
Sol. +0.005 gm. 
FeCls 
D, 
Fe from 
Sol. +0.005 gm. Fe from 
FeCh+0.4 gm. Mn0 2 
Sol. +0.005 gm. Fe from 
FeCh+0.018 gm. Mn 
from MnSO<. 
f 1_ 2 
\ 3- 4 
I 5- 6 
• I 11- 12 
f 13- 14 
\ 15- 16 
I 17- IS 
Sol. +0.005 gm. Fe from 1 ia _ ™ 
FeCl 3 +0.4 gm. M11O4; I ^T g 
leaves dipped in 0.5 per ( ™ %. 
cent FeCls solution. J a ~ A 
Sol. +0.010 gm. 
FeCh. 
Fe from 
Sol. +0.010 gm. Fe from 
FeCl 3 +0.4 gm. Mn0 2 . 
Sol. +0.010 gm. Fe from 
FeCl 3 +0.01S gm. Mn 
from MnS04. 
Sol. +0.010 gm. Fe from } ,, *. 
FeCl 3 ; leaves dipped in I jt it ?™ 
0.5 per cent FeCl 3 solu- f *2~ !£ £ 'A 
tion. *' * 8 °- °° 
2> 
30 
31- 32 
<[ 33- 34 
[ 35- 36 
( 37- 38 
\ 39- 40 
: I 41- 42 
Grams. 
20.50 
20.34 
19.89 
.25 
.28 
.28 
1.15 
1.14 
1.16 
.85 
.93 
.92 
20.52 
20.48 
19.97 
2.37 
1.87 I 
2.16 | 
3.92 | 
3.79 
4.13 
Sol. +0.020 gm. Fe from 
FeClj. 
Sol.+0.02C gm. Fe from 
0.4 gm. Mn0 2 . 
Sol. +0.020 gm. Fe from 
FeCl 3 +0.01S gm. Mn 
from MnSO<. 
Sol. +0.020 gm. Fe from 
FeCh; leaves dipped in 
0.5 per cent FeCU solu- 
tion. 
Sol. +0.040 gm. Fe from 
FeCU. 
Sol. +0.040 gm. Fe from 
FeCh+0.4 gm. Mn0 2 . 
Sol. +0.040 gm. Fe from 
FeCh-i-0. 01s gm. Mn 
from MnSOi. 
Sol. +0.080 gm. Fe from 
FeCl 3 . 
Sol. +0.080 gm. Fe from 
FeCh+0.4 gm. MnOj. 
Sol. +0.080 gm. Fe from 
FeCh+0.018 gm. Mn 
from MnS0 4 . 
f 49- 
1 51 " 
l 53- 
(55- 
l 59- 
f 61- 
\ 63- 
l 65- 
67- 
Vh 
71- 
79- 80 
81- 82 
83- 84 
85- 86 
87- 88 
89- 90 
91- 92 
93- 94 
95- 96 
97- 98 
99-100 
101-102 
103-104 
105-106 
107-108 
15.58 
16.83 
15.38 I 
Grams. 
3.33 
3.39 
3.33 
.09 
.09 
.09 
.30 
.30 
.31 
3.60 
3.46 
.50 
.43 
.48 
.92 
.91 
.95 
1.16 
1.13 
1.11 
2.60 
2.89 
2.61 
56 
5S 
60 
10.72 
10.70 
1.17 
1.83 
1.87 
2.00 
62 
64 
66 
6.56 
7.16 
6.26 
1.56 
1.53 
1.43 
9.58 
10.15 
10.70 
3.17 
3.58 
3.06 
4.58 
4.96 
4.70 
2.98 
2.85 
2.96 
.42 
.67 
.42 
1.16 
1.18 
1.30 
.66 
.64 
.59 
1.83 
1.91 
1.86 
.91 
.78 
1.09 
1.18 
1.12 
.75 
.67 
.72 
.14 
.20 
.12 
.30 
.31 
.36 
.19 
.18 
.17 
Grams. 
1.30 
1.34 
1.30 
.06 
.06 
.08 
.08 
.08 
.11 
.11 
.10 
1.34 
1.23 
1.16 
.16 
.14 
.18 
.20 
.17 
.21 
.45 
.46 
.44 
.78 
.94 
.78 
.61 
.65 
.67 
.38 
Grams. Grams. 
3.35 
09 
30 
.24 
3.57 
.47 
93 
1.13 
2.70 
1.90 
^4 
1.13 
.15 
38 
35 
4.81 
-,3 
IVery fine; green; 
healthy. 
'(Bleached white; 
I withered; very 
j stunted; practi- 
l cally dead. 
{Very stunted; yel- 
lowish; lower 
leaves withered 
and spotted with 
brown. 
Decided improve- 
ment over A 2 ; 
yellowish-green, 
showing dark 
green spots 
where iron pene- 
trated. 
Green; healthy. 
Stunted; yellow- 
ish-green spotted 
with brown. 
1.12 
3.53 
2.54 
1. 87 2. 60 
1.55 
71 .99 
15 . 23 
32 . 42 
.18 
29 
Light green; lower 
leaves withered. 
Decided improve- 
ment over B 2 ; 
light-green spot- 
ted with dark 
green where iron 
penetrated. 
Green; healthy. 
Leaves rather light 
green, showing 
only few brown 
spots. 
Few brown spots 
on lower leaves. 
•About same as C2. 
Much smaller than 
Ai; dark green; 
roots formed fuz- 
zy ball but ap- 
parently were 
unable to enter 
the solution. 
Slightly larger than 
Di; dark green. 
Dark green. 
Very stunted; 
leaves withered; 
only a few strug- 
gling roots with 
brown iron de- 
posit. 
Larger than E j 
with better roots. 
About same as Ei. 
