MANGANESE CHLOROSIS OF PINEAPPLE. 
23 
Table 14. — Comparative weights of rice plants which were grown in manganese 
dioxid and calcium carbonate and in calcium carbonate solutions alone, to which 
were added various amounts of iron as ferrous sulphate. 
Culture solutions with 
amount of added mate- 
rial 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 
Whole 
kavt.le'-t- 
Condition of plants. 
Ai 
* M 
A 3 
Aj 
C 2 
C 3 
C t 
T>i 
D 2 
Dj 
Ei 
E 2 
Sol. +0.005 gm. Fe from 
FeSO*. 
Sol.+0.005 gm. Fe from 
FeSO 4 +0.4 gm. Mn0 2 + 
0.4 gm. CaC0 3 . 
Sol.+0.005 gm. Fe from 
FeSO4+0.4gm. CaCOs, 
Sol.+0.005 gm. Fe from 
FeSO 4 +0.4gm. Mn0 2 + 
0.4 gm. CaCOs; leaves 
dipped in 0.5 per cent 
FeS04 solution. 
Sol. +0.010 gm. Fe from 
FeS0 4 . 
Sol.+O.OlO gm. Fe from 
FeSO4+0.4gm.MnO 2 -f 
0.4 gm. CaC0 3 . 
Sol.+O.OlO gm. Fe from 
FeSO4+0.4gm. CaC0 3 . 
Sol.+O.OlO gm. Fe from 
FeSO 4 +0.4 gm. Mn0 2 + 
0.4 gm. CaCOs; leaves 
dipped in 0.5 per cent 
FeS04 solution. 
Sol. +0.020 gm. Fe from 
FeS04. 
Sol.+0.020 gm. Fe from 
FeSO 4 +0.4gm.MnO 2 + 
0.4 gm. CaC0 3 . 
Sol. +0.020 gm. Fe from 
FeSO4+0.4gm.CaCO 3 . 
Sol. +0.020 gm. Fe from 
FeSO4+0.4gin.MnO 2 + 
0.4 gm. CaC0 3 ; leaves 
dipped in 0.5 per cent 
FeS04 solution. 
Sol. +0.040 gm. Fe from 
FeS0 4 . 
Sol. +0.040 gm. Fe from 
FeSO 4 +0.4 gm. Mn0 2 + 
0.4 gm. CaC0 3 . 
Sol. +0.040 gm. Fe from 
FeSO4+0.4gm. CaC0 3 . 
S0I.+O.O8O gm. Fe from 
FeSO«. 
Sol. +0.080 gm. Fe from 
FeSO 4 +0.4 gm.Mn0 2 + 
0.4 CaC0 3 . 
Sol. +0.080 gm. Fe from 
FeSO4+0.4 gm. CaC0 3 . 
1- 2 
3- 4 
5- 6 
7- 8 
9-10 
11-12 
13-14 
15-16 
17-18 
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 
67-68 
69-70 
71-72 
73-74 
75-76 
77-78 
79-80 
81-82 
83-84 
85-86 
87-88 
Grams. 
13.07 
13.48 
12.98 
.27 
.26 
.28 
.85 
.82 
.74 
91-92 
93-94 
95-96 
97-98 
99-100 
[101-102 
103-104 
105-106 
107-108 
Grams. 
2. 73 
2.66 
.10 
.10 
.10 
.21 
.20 
.17 
4.29 
4.30 
4.43 
12.38 
14.86 
12.97 
.22 
.18 
.23 
.62 
.81 
.83 
3.14 
3.66 
3.51 
14.11 
13.37 
15.15 
.20 
.21 
.24 
5.00 
4.58 
5. It) 
1.22 
1.47 
1.24 
11.82 
12.17 
12.74 
.47 
.52 
.64 
10.68 
11.55 
11.59 
5.97 
7.24 
5.78 
5.13 
4.50 
5.32 
11.61 
12.58 
11.25 
2.62 
2.76 
2.75 
.08 
.06 
.09 
.16 
.20 
.21 
.71 
.71 
2.71 
2.64 
2.73 
.07 
.07 
.97 
.97 
.27 
.34 
.30 
2.60 
2.97 
2.74 
.15 
.15 
.19 
2.14 
2.31 
2.29 
1.52 
1.64 
1.45 
1.05 
1.12 
1.22 
2.20 
2.52 
2.31 
Grams. 
0.75 
.77 
.77 
.07 
.07 
.07 
.11 
.82 
.88 
.05 
.05 
.06 
.36 
.34 
.35 
.13 
.13 
.16 
.87 
1.02 
.11 
.12 
.67 
.67 
.79 
.51 
.56 
.50 
.35 
.34 
.42 
.73 
.72 
.72 
Grams. 
2.69 
2.71 
Grams. 
1.01 
.30 
2.77 
2.25 
1.54 
1.13 
"2.~34 
3.45 
.30 
1.20 
3.55 
Fine,green,healthy . 
1 Bleached white; 
spotted with 
brown; stunted. 
Yellowish-w h i t e; 
faint, green, 
brown spots; lit- 
tle better than 
A 2 . 
Green and healthy; 
dark green spots 
where iron pene- 
trated. 
Green; healthy. 
.28 
1.00 
3.55 
.13 
"l."36 
.44 
with- 
2.96 
2.06 
T50" 
"3.~06" 
Same as A 2 ; 
ered. 
Same as A 3 . 
Same as A 4 . 
•Green; healthy. 
•Same as Bi. 
Light yellowish- 
green; somewhat 
stunted. 
•Same as A4. 
Green; healthy. 
Yellowish -green 
spotted with 
brown; stunted. 
Somewhat light in 
color. 
Green; healthy; 
roots injured by 
excessive iron. 
Light green; rather 
stunted. 
Fine, dark-green 
plants. 
Calcium carbonate with 5 and 10 milligrams per liter of iron 
supplied from ferrous sulphate caused a strongly chlorotic condition 
and severe depression in growth. Chlorosis almost disappeared with 
20 milligrams and did not occur at all with 40 and 80 milligrams. 
In fact, with 80 milligrams calcium carbonate caused a decided 
