Apr. 28, 1923 
Toxicity and Antagonism of Alkali Salts m Soil 
331 
The nitric acid is the most toxic material in this trial, as was the 
hydrochloric acid in figure 9, and the potassium salt is the least harmful. 
The general similarity of the nitrate and chlorid curves is evident, and 
y i^OOO COa £XC£PT JrP£/?£ 
/OOO 2600 ^fOOO food 2600 0600 /OOP 2600 4000 
— 
n 
SSmm 
iim 
□ 
n 
i 
1 
MM 
m 3 
sg 
s 
s 
1 
t— 
“1 
s 
s 
3 
mm^ 
MM ' 
ss 
L 
\ 
S' 
5 
n 
li 
3 
i 
i 
n 
s 
% 
Zj 
3 
_ 
J 
J 
I 
PPM. SPLTS y. CSOOO A/ctz CO3 £XC£PT fyM£P£ (J/VM/XEO) 
fOOO 2500 0000 /OOO 2500 4000 /OOO 2500 4000 
mmsi 
V 
1 ^ 
N^ 
rv 
" 1 
Mid C 
5v r 
t 
-^4 
-5^ 
L \ 
t- 
V 
* 
1 ' 
\ V 
& 
*»*HNOsPLON£ 
- f<N 03 PLON£ 
*^^//aN03/)L0N£ 
- 4 ^/ 00 A/O3 UA^ajfCSOj 
- 
N 034 kKN 0 A '* 
- \HN 034 hiKN 0 ^^ 
.— //etz CO 3 
Fig. 10.—Diagram showing the effect on the growth of wheat plants of adding nitrates in various pro¬ 
portions to Greenville loam impregnated with sodium carbonate. The maximum concentrations of 
the individual nitrates are given in the text. 
the same conclusions may be drawn concerning the additive toxicity of 
the carbonate and the corrective action of small quantities of the nitrates 
on this salt. In this case, however, the antagonistic action is fairly 
large in the third carbonate concentration and negligible in the fourth. 
