MANGANESE CHLOROSIS OF PINEAPPLE. 
21 
ferric citrate was substituted for ferrous sulphate as the source of 
iron and the plants in series A 4? B 4 , and C 4 were dipped in a 0.5 per 
cent solution of ferric citrate instead of ferrous sulphate. 
The weights of the plants on the fortieth day are given in Table 13 
and graphically in Figure 3. 
Table 13. — 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 citrate. 
Se- 
ries. 
Culture solution 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. 
Stalks 
and 
leaves. 
Whole 
plant. 
Condition of plants. 
Aj Sol. +0.005 gm. Fe from 
Fej (CeHsOr)*. 
Aj Sol. +0.005 gm. Fe from 
Fe 2 (C 6 HsO7)2+0.4 gm. 
MnOj. 
1- 2 
3- 4 
5- 6 
7- 8 
9- 10 
11- 12 
Aj i Sol. +0.005 gm. Fe from 1 13- 14 
Fe2(C6H 5 O:)2+0.018gm.|> 15- 16 
MnfromMnSOi. |J 17- 18 
A< Sol. +0.005 gm. Fe from 
Fes (C 6 H 5 O-)2+0.4 gm. 
MnOs; leaves dipped 
in a 0.5 per cent Fe2 
(C 6 H 5 0;)2 solution. jj 
Bi I Sol. +0.010 gm. Fe from 
Fe 2 (C6H s 07)2. 
B: Sol. +0.010 gm. Fe from 1 
Fe2(C6H 5 O:)2+0.4 gm. 
MnOi. 
B3 Sol. +0.010 gm. Fe from I 
Fe 2 (C 6 H 5 O-)2+0.018 |] 
gm. Mn from MnSOi. 
Bi Sol. +0.010 gm. Fe from 
Fe2(C 6 H 5 O:)2+0.4 gm. 
MnOif, leaves dipped 
in a 0.5 per cent Fe2 
(C6H 5 0r)2 solution. 
Ci Sol. +0.020 gm. Fe from 
Fe2(C6H 5 0:)2. 
C; Sol. +0.020 gm. Fe from 
Fe2(C6H 5 O:)2+0.4 gm. 
Mn0 2 . 
C3 Sol. +0.020 gm. Fe from 
Fei(CeH|0 7 ) 2+0.018 
gm. Mn from MnS04. 
C 4 Sol. +0.020 gm. Fe from 
Fe2(C 6 H 5 O7)2+0.4 gm. 
MnO:; leaves dipped 
in a 0.5 per cent Fe2 
(C6Hs07)2 solution. 
Di Sol. +0.040 gm. Fe from 
Fe2(CeH 5 07)2. 
D 2 Sol. +0.040 gm. Fe from 
Fe2(C 6 H 5 O7)2+0.4 gm. 
MnO a . 
D3 Sol. +0.040 gm. Fe from 
Fe2(C 6 H 5 07) 2+O.OI8 
gm. Mn from MnS04. 
Ei Sol. +0.080 gm. Fe from 
Fe2(C 6 H 5 0;)2. 
E2 Sol. +0.080 gm. Fe from 
Fe2(C 6 H 5 O7)2+0.4 gm. 
MnOj. 
E 3 . Sol. +0.080 gm. Fe from 
Fe2(C 6 H 5 O : )i + 018 
gm. Mn from MnS04. 
19- 20 
21- 22 
23- 24 
25- 26 
27- 28 
29- 30 
31- 32 
33- 34 
35- 36 
37- 38 
39- 40 
41- 42 
43- 44 
45- 46 
47- 48 
49- 50 
51- 52 
53- 54 
55- 56 
57- 58 
59- 60 
61- 62 
63- 64 
65- 66 
69- 70 
71- 72 
73- 74 
7.5- 76 
77- 7^ 
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 
! 
Grams. Grams. 
15.61 2.41 
14. 16 2. 29 
15. 98 2. 56 
.59 
.85 
.61 
.16 
.15 
.16 
1.60 
1.62 
1.20 
16.85 
17.44 
17.14 
.63 
.53 
.55 
.12 
.13 
.17 
.97 
1.05 
.91 
IS. 33 
18.47 
18.39 
.79 
.95 
1.09 
1.68 
•1.59 
1.44 
3.40 
3.22 
3.88 
17.90 
18.96 
19.40 
5.27 
6.79 
5.67 
9.01 
9.44 
8.78 
15. 27 
16.06 
16.57 
6.47 
6.53 
6.68 
9.84 
9.80 
9.78 
.11 
.18 
.13 
.07 
.07 
.07 
.32 
.25 
.30 
2.99 
3.06 
3.19 
.14 
.13 
.13 
.05 
.23 
.24 
.21 
3.43 
3.34 
3.52 
.20 
.23 
.26 
.42 
.41 
.35 
.73 
.74 
.74 
3.07 
3.40 
3.66 
1.04 
1.25 
1.08 
1.81 
1.95 
1.82 
2.95 
2.86 
3.03 
1.34 
1.36 
1.41 
2.21 
2.08 
2.18 
Grams 
1.00 
.85 
1.06 
.08 
.11 
.07 
.04 
.04 
.04 
.19 
.14 
.17 
1.00 
1.04 
1.10 
.08 
.07 
.07 
.04 
.04 
.05 
.10 
.09 
.13 
1.17 
.95 
1.08 
.11 
.11 
.12 
.18 
.17 
.14 
.37 
.37 
.37 
1.22 
1.31 
1.10 
.56 
.64 
.59 
.59 
.61 
.65 
1.45 
1.53 
1.69 
.65 
.67 
.60 
1.01 
.92 
.98 
Grams. 
Grams. 
2.42 
.14 
.07 
.29 
.23 
3.43 
.23 
.74 
3.38 
1.12 
2.95 
1.37 
2.16 
3.39 
23 
.46 
4.13 
20 
.10 
34 
34 
1.11 
4.59 
1.72 
~2.~48~ 
4.51 
2."6i" 
3.~l3~ 
Fine, green plants. 
Very stunted; yel- 
lowish-white 
spotted with 
brown. 
Withered; brown; 
practically dead. 
Decided improve- 
ment over Aj; 
light green spot- 
ted with dark 
green where iron 
penetrated. 
Fine, dark green 
plants. 
Same as A 2; leaves 
bleached. 
Same as A3. 
Decided improve- 
ment over B2; 
light green spot- 
ted with dark 
green where iron 
penetrated. 
Fine, green plants. 
Yellowish -white; 
stunted; spotted 
with brown. 
About same as Cj. 
'Good, dark green, 
spotted with 
very little 
brown. 
Fine, green plants. 
Light green; good 
plants spotted 
with little brown 
Same as Da. 
Fine, green plants. 
Light green; very 
few brown spots; 
fairly good plants. 
Light green; no 
brown spots; 
fairly good plants. 
