812 
Journal of Agricultural Research 
Vol. XXIII, No. io 
For the reasons discussed, relatively high concentrations of some of 
the solutions were used. It should be indicated that the quantities of 
injected solutions absorbed are relatively small in comparison with the 
quantities of the soil solution and other solutes which are absorbed by 
the plants. Neither is the quantitative complex of nutrients in the cell 
sap known. The injected solutions represent additions to the actual 
quantities absorbed by the plants. Obviously, it is difficult to study the 
effects of the various solutes in the stalks in the field. Therefore, the 
chief value of the injection experiments was to learn what effect the vari¬ 
ous ions had upon the plant tissues when injected into them in addition 
to those which were already present in the sap. 
The results of the injections are given in Table II. The solutions were 
mostly i per cent concentrations of the various solutes. The character¬ 
istic effects of the iron and aluminum salts are especially noteworthy. The 
effects are referred to in Table II as being either injurious or causing no in¬ 
jury but their specific actions will be described in greater detail in the text. 
Table II.— Effects of solutes injected into corn plants, based on the average results from 
five similarly treated stalks, all of the same age and approximate size, from readings made 
seven days after injection 
Solute. 
Aluminum chlorid. 
Aluminum nitrate. 
Calcium nitrate.... 
Aluminum nitrate. 
Calcium nitrate.... 
Aluminum nitrate. 
Calcium nitrate.... 
Aluminum nitrate. 
Calcium nitrate.... 
Sulphuric acid 
Hydrochloric acid. 
Phosphoric acid.... 
Tartaric acid. 
Citric acid. 
Acetic acid. 
Malic acid. 
Formic acid. 
Iron citrate. 
Ferrous sulphate... 
Iron citrate. 
Magnesium acetate. 
Iron citrate. 
Magnesium acetate. 
Iron citrate. 
Calcium citrate.... 
Iron citrate. j 
Calcium acetate. 
Strength. 
Per cent. 
I 
N/5 
N/io 
N/ao 
N/20 
Average 
quantity- 
injected. 
Cc. 
IO) 
I5J 
H\ 
i*y 2 
12 
I5 I 
10/ 
19 
5 
IO 
*5 
20 
*5 
25 
25 
30 
30 
30 
30 
200 
10 
20 
30 
Result. 
\Completely fired and streaked; nodes de- 
j stroyed. 
heaves streaked, partially fired; node 
destroyed. 
Do. 
Leaves streaked; fired; nodes destroyed. 
No apparent injury. 
fNo apparent injury to leaves; nodes 
\ slightly discolored. 
(Leaves streaked; necrosis of intervascular 
\ tissues; nodes slightly disintegrated. 
{ Streaked; necrosis of intervascular leaf tis¬ 
sues; and disintegration of nodal plate 
tissues. 
Plant killed; nodal tissues destroyed. 
Plant apparently normal. 
No apparent injury. 
Do! 
Do. 
. Do. 
Do. 
1 
o. 25 
o-S 
1 
5 
1 • 
1 
1 
1 
1 
1 
1 
1 
1 
30 
30 
30 
30 
30 
20} 2 S 
$ * 
2!} 2 5 
12 Hi 5 
Plant killed; nodal plate tissues de¬ 
stroyed. 
Very slight marginal firing. 
Plant killed; nodal tissues brown. 
Do. 
Do. 
Leaves purple-streaked, the streaked tis¬ 
sues firing with a distinct gray color. 
No apparent injury. 
Leaves purple streaked; nodes discolored. 
No injury. 
Purple streaks on leaves; nodes discolored. 
