8 BULLETIN 108, U. S. DEPARTMENT OF AGRICULTURE. 
Table IV gives the growth in cultures composed principally of 
phosphate, without and with 10 parts per million of salicylic aldehyde. 
The composition of the culture solution is given in the first three 
columns. As will be seen, the solutions contained principally phos- 
phate, but also varying smaller amounts of nitrate and potash. In 
the fourth column is given the green weight of the plants grown in 
solutions which contain no salicylic aldehyde, and in the fifth column 
the weight of the plants in solutions containing 10 parts per million 
of salicylic aldehyde. 
By comparing these two columns in the table it is seen that the 
green weight of the salicylic aldehyde culture is less in every case, 
with one exception only, than the green weight of the culture of the 
same fertilizer mixture without the salicylic aldehyde. The total 
green weight of the 21 normal, or control, cultures was 39.61 grams, 
against 31.74 grams for the 21 cultures with salicylic aldehyde. 
Table IV. — Effect of salicylic aldehyde on wheat in nutrient culture solutions composed 
principally of phosphate. 
Composition of culture 
solution. 
P 2 5 
NHs 
Parts per 
Parts per 
million. 
million. 
80 

72 

72 
8 
64 

64 
8 
64 
16 
56 

56 
8 
56 
16 
56 
24 
48 

K 2 
Parts per 
million. 

8 

16 
8 

24 
16 
8 

32 
Without 
salicylic 
aldehyde . 
Green 
weight. 
Grams. 
1.02 
1.32 
1.30 
1.32 
1.70 
1.54 
1.24 
2.34 
2.04 
1.34 
1.62 
With 
salicylic 
aldehyde, 
10 parts 
per 
million. 
Composition of culture 
solution. 
With 
Without -gg 
salicylic innarfs 
aldehyde. 10 ^ e a r rtS 
; million. 
Green 
weight. 
Grams. 
0.76 
1.04 
1.14 
1.22 
1.44 
1.14 
1.3S 
1.52 
1.66 
1.28 
1.22 
P2O5 
XH, 
K2O 
Green 
weight. 
Green 
weight. 
Parts per 
Parts per 
Parts per 
1 million. 
million. 
million. 
Grams. 
48 
S 
24 
2.50 
48 
16 
16 
2.60 
48 
24 
8 
2.50 
4S 
32 

1.64 
40 

' 40 
1.75 
40 
8 
32 
1.90 
40 
16 
24 
2.98 
40 
24 
16 
2.88 
40 
32 
8 
2.28 
40 
40 

1.80 
Grams. 
1.54 
1.92 
1.8S 
1.34 
1.10 
1.52 
2.16 
2.14 
1.74 
1.60 
Table V gives the results of salicylic aldehyde in nutrient solution 
in which the principal ingredient is nitrate. 
As seen in the fourth and fifth columns of the table, the growth 
in cultures with salicylic aldehyde are much smaller than the growth 
in solutions containing merely the nutrient salts. The total green 
weight of the 21 cultures in nutrient salts was 49.36 grams, and the 
green weight of the 21 nutrient cultures containing 10 parts per 
million salicylic aldehyde was only 36.11 grams. From these figures 
it is seen that salicylic aldehyde in these nutrient solutions, princi- 
pally nitrogenous, as in the phosphate solutions, is quite harmful 
to wheat plants. 
