INJURY BY DISINFECTANTS TO SEEDS AND ROOTS. 
21 
Table V. — Injury to roots in plats treated ivith sulphuric acid 12 to 16 days before sowing 
and later treated with lime. 
Treatment (per 
square foot). 
Days from 
acid treat- 
ment to — 
8 a 
fe sr 
= °_ 
CO "2 ,-> 
S'3^ 
85 d 
h 
i 
B 
o 
i 
5" 
Plat. 
c 
'3 
a 
o 
3 
"o 
w 
"o 
8 
.9 
o° 
ft 
*~ d° 
> oO 
< 
a 
"S 
H 
a 
2 
d 
.1 
g 
O 
Weeds present 1* months after 
acid application. 
Pinus ponder- 
osa (series 
504-E) 
P. divarieata 
(series 507): 
0.375 
None. 
.375 
.500 
.500 
.500 
.750 
.750 
.750 
None.. 
2 
3 
2 
4 
4 
4 
2 
6 
0.250 
None. 
.250 
.333 
.333 
.200 
.333 
.500 
.500 
.125 
.250 
.375 
.500 
None. 
.333 
.250 
.500 
14 
25 
0.240 
36 
None. 
Half as many as in check plats 
of same series. 
Grass and Mollugo abundant; 
some Amaran thus, Portulaca, 
and Euphorbia in each plat. 
Very few, mainly grass and 
Mollugo, but growth much 
more vigorous than in 
checks. 
| 
M 
G 
K 
P 
E 
L 

F 
6 
8 
9 
7 
7 
7 
7 
20 
23 
24 
22 
22 
22 
22 
.240 
.321 
.321 
.392 
.571 
.481 
.481 
36 
36 
36 
22 
24 
36 
36 
Slight. 
None. 
...do.. 
...do.. 
...do.. 
...do.. 
Slight. 
None.. 
...do... 
...do... 
...do... 
C 
R 
A 
...do... 
...do... 
...do... 
None. 
.500 
.500 
None. 
2 
4 
1 More weeds than in untreated 
| plats, in vigorous condition. 
P. resinosa 
(series 514): 
Grass, Mollugo, Euphorbia, 
Portulaca, and Amaranthus. 
Less than in checks; grass, 
Mollugo, and Euphorbia. 
Less than in checks; grass, 
Euphorbia, and Amaranthus. 
As for check. 
J 
K 
N 
5 
5 
24 
24 
.321 
.365 
36 
27 
None. 
...do.. 
...do.. 
1 Based on equivalent weights, assuming for the commercial sulphuric acid a maximum specific gravity 
of 1.84 and a purity of 95 per cent. No allowance is made for impurities in the lime. 
It appears that at least in plats M and O the acid applied was not 
reduced to two-fifths of its original amount during the first six or 
seven days after application. The injury in plat M, with its acid 
excess of only 0.24 ounce, when compared with the lack of serious 
injury in other plats with a greater excess of acid (notably plat E, 
with an excess 2f times as great), is a further indication of the 
relative stability of weak acid solutions in the soil. 
In the case of series 514, acid injury occurred in a plat treated with 
a relatively small amount of hydrochloric acid, and it is quite certain 
that only the lime prevented injury in plats J and K. 
Ammonia was also tested, following sulphuric acid. On jack pine, 
0.750 fluid ounce of acid applied 21 days before sowing was followed 
a few days later by 0.469 ounce of the strongest commercial grade of 
ammonia. No injury to pines occurred. Watering in this series 
was very frequent, so injury might have taken place with ordinary 
watering despite the lime used. In series 514, a red-pine plat 
treated with 0.562 ounce of acid 13 days before sowing, followed by 
