Nov. 27, 19x6 Effect of Sodium on Absorption of Plant Food 409 
Table I .—Effect of sodium chlorid on the weight and composition of wheat seedlings 
Culture 
Parts per million of 
sodium chlorid 
added to nutrient 
solution. 
Green 
weight 
Dry- 
weight 
of 100 
plants. 
Weight of element in ioo plants. 
Percentage of dry 
weight of plants. 
of IOO 
plants. 
N. 
KaO. 
P2O5. 
N. 
K 2 0. 
P2O5. 
1 
O. 
Gm. 
7 i- 5 
Gm. 
6.21 
Gm. 
O. 240 
Gm. 
0. 41X 
Gm. 
O. 125 
3-9 
6.6 
2. O 
2 
50 .;. 
59 - 5 
5 - 7 ° 
. 236 
•334 
. 119 
4 - 1 
5-9 
2. I 
3 
IOO. 
58-5 
5 - 70 
. 252 
•343 
• 125 
4.4 
6. 0 
2. 2 
4 
200. 
61. s 
5 - 70 
.249 
•345 
. 124 
4. 4 
6. 1 
2. 2 
. 5 
3 00 ... 
63-5 
5 - 70 
•251 
•332 
• 125 
4.4 
s-f 
2. 2 
6 
400. 
64- 5 
5 - 9 6 
• 230 
.288 
•US 
3-9 
4.8 
1.9 
7 
5 00 .. • 
59 -o 
5 - 2 9 
.231 
• 348 
• 133 
4.4 
6.6 
2 - 5 
8 
1,000. 
56. 6 
5 * 55 
. 216 
.322 
. 121 
3-9 
5-8 
2 . 2 
Fig. 2 .—Graphs showing the effect of sodium sulphate in nutrient solutions on the nitrogen, potash, and 
phosphoric-add content of wheat seedlings. 
SODIUM SULPHATE 
The data obtained with culture solutions containing graduated amounts 
of sodium sulphate are given in Table II. The results of the analyses 
of the plants for nitrogen, potash, and phosphoric acid are given both in 
terms of the actual amounts found in 100 plants from each culture and 
also in percentage of the dry weight of the plants. The dry weight is 
nearly uniform, so that the percentage relationship does not differ 
materially from that represented by the absolute amounts of nitrogen, 
potash, and phosphoric acid found. - The latter determinations are plotted 
as ordinates in figure 2 and the concentration of sodium sulphate in the 
culture solutions as abscissae. The results show that the addition of 
sodium sulphate to the nutrient solution in concentrations up to 1,000 
p.p.m. has practically no effect on the total nitrogen content of the 
young wheat plants. In concentrations greater than 400 p. p. m. the 
sodium sulphate depressed the potash content slightly. In the case of 
phosphoric acid the plants show a very slight but steady decrease in the 
