Nov. 27.1916 Effect of Sodium on Absorption of Plant Food 
411 
Table III .—Effect of sodium carbonate on the weight and composition of wheat seedlings 
FIRST SERIES 
Cul¬ 
ture 
Parts per million of so¬ 
dium carbonate add¬ 
ed to nutrient solu¬ 
tion. 
Green 
weight 
of IOO 
plants. 
Dry- 
weight 
of IOO 
plants. 
Weight of element in ioo plants. 
Percentage of dry 
weight of phtnts. 
No. 
N. 
K2O. 
P2O5. 
N. 
K2O. 
P2O5. 
. I 
0. 
Gm. 
60. 3 
Gm. 
5 - 59 
Gm. 
O. 128 
Gm. 
O. 329 
Gm. 
O. 130 
2-3 
5-8 
2-3 
2 
50 . 
61. 0 
5 - 65 
• 139 
•327 
. 118 
2. 5 
5-8 
2. 1 
3 
IOO. 
S 3 -6 
4.89 
. 156 
. 287 
. 108 
3 - 2 
5-9 
2. 2 
4 
200. 
53-2 
4 - 93 
. 164 
•307 
• i °5 
3-3 
6. 2 
2. 1 
5 
300 . 
50.5 
4. 92 
. 140 
•275 
•093 
2.9 
5-6 
1.9 
6 
400. 
32. 7 
3 -36 
. 148 
.158 
.050 
4. 4 
4*7 
i -5 
7 
500 . 
28. 0 
3.81 
. 098 
• 113 
. 049 
2. 6 
2.9 
i -3 
8 
1,000. 
i 5 - 5 
2. 77 
. 087 
. 047 
•037 
3-2 
i -7 
i -3 
SECOND SERIES 
O. . . . 
50.. . 
IOO. . 
200 . . 
30°.. 
400.. 
500.. 
1,000 
71- s 
57- 5 
57- 5 
52- 5 
40. 5 
31-3 
36. s 
20. 5 
6 . 21 
5.61 
5.42 
5- 11 
4. 42 
4-25 
4. 11 
3. 16 
o. 240 
. 230 
*257 
. 209 
. 160 
• 125 
■ 144 
. no 
o. 411 
• 332 
• 331 
•359 
. 291 
• 230 
• 144 
. 061 
o. 125 
• 115 
. 116 
. 101 
.097 
. 067 
• 057 
. 046 
3- 9 
4. 1 
4- 7 
4. 1 
3 *^ 
2.9 
3- 5 
3- 5 
6.6 
5-9 
6. 1 
7.0 
6 . 6 
5-4 
3- 5 
1.9 
2. o 
2. 1 
2. 1 
2. o 
2. 2 
1. 6 
1.4 
Fig. 4. —Graphs showing the effect of sodium carbonate on the nitrogen, potash, and phosphoric-acid con¬ 
tent of wheat seedlings. Second series. 
These results are in such striking contrast with the effects obtained 
with the other sodium salts that the sodium-carbonate series was re¬ 
peated. The results of the second series of determinations are also given 
in Table III and are presented graphically in figure 4. A marked reduc- 
64313°—16-3 
