Aug. 15, 1925 
Soil Disinfection for Potato Wart 
339 
chemicals were applied in part of the water and the remainder of the 
water was applied subsequently. In soil containing 4 per cent or 
less of moisture the average penetration was about 7 inches; in soil 
containing 10 to 16 per cent or 20 to 23 per cent of moisture the 
penetration averaged 8 inches; while in soil containing 17 to 19 per 
cent the penetration averaged somewhat more than 8 inches. The 
depth of penetration seems to have been about the same whether 
the chemicals were applied in all or in part of the water. 
Table VII .—Penetration of mercury in mercuric chloride plus sodium chloride 
solutions in Manor loam f as shown hy hydrogen sulphide. Average penetration 
(inches) at different percentages of soil moisture of applications totaling 1 gallon 
per square foot 
In soil containing 4 per cent moisture 
Proportion of solu¬ 
tion + water 
1 day 
2 days 
3 days 
4 days 
5 days 
6 days 
7 days 
9 days 
Number 
of tubes 
1+0 _ 
Inches 
7 to 8 
7 
Inches 
Inches 
7- 
7+ 
7+ 
7 
Inches 
Inches 
7- 
8- 
7+ 
7+ 
Inches 
Inches 
Inches 
9 
48 
27 
6 
1+1 
7+ 
6+ 
8- 
7+ 
1+3 
_ 
8 to 9 
1+7 
In soil containing 10 to 16 per cent moisture 
1+0 
i 
8 
8+ 
7 to 8 
8 to 9 
18 
1+1 „ , . . 
8- 
8— 
8+ 
8 to 9 
* 
30 
1+3 ... 
7+ 
8- 
6 to 7 
7" "to 8 
18 
1+7 
7+ 
8— 
8 to 9 
8+ 
12 
In soil containing 17 to 19 per cent moisture 
1+0 
8— 
9 
9 to 10 
9 to 10 
9 to 10 
24 
1+1_ 
8 to 9 
8+ 
8+ 
9 
9 to 10 
9 
9 to 10 
9 to 10 
40 
1+3_ 
9- 
9 
8+ 
8+ 
8+ 
9- 
8+ 
, 9 to 10 
70 
1+7 
8- 
9- 
8+ 
8 to 9 
8 to 9 
8+ 
36 
In soil containing 20 to 23 per cent moisture 
1+0 
6+ 
7 
7 to 8 
7- 
■ 8- 
12 
1+1 
7 to 8 
7 to 8 
7 to 8 
8 to 9 
14 
1+3.. 
8- 
9 to 10 
8+ 
9 
12 
1+7 
7— 
8- 
8 to 9 
8 to 9 
12 
SUMMARY * 
Per cent moisture 
1 day 
2 days 
3 days 
4 days 
5 days 
6 days 
7 days 
9 days 
Number 
of tubes 
4 
Inches 
7- 
Inches 
7- 
8- 
9- 
7- 
Inches 
7+ 
8- 
8+ 
8 " 
Inches 
8- 
8- 
8+ 
8- 
Inches 
7+ 
9- 
8+ 
8- 
Inches 
Inches 
Inches 
8 to 9 
90 
78 
170 
50 
10 to 16 
8- 
8+ 
8- 
S to 9 
9- 
17 to 19__ 
8- 
9 to 10 
8 to 9 
20 to 23 
Total 
388 
a 1+0=1 gallon H Per cent HgCh+2K per cent NaCl per square foot. 
1 + 1=34 gallon 1 per cent HgCl2+5 per cent NaCl+34 gallon water per square foot. 
1+3=1 quart 2 per cent HgCh+10 per cent NaCl+3 quarts water per square foot. 
1 + 7=1 pint 4 per cent HgCl2+20 per cent NaCl+7 pints water per square foot. 
See p. 332, “How solutions were applied.” 
* This combines the data contained under 4,10 to 16,17 to 19, and 20 to 23 per cent moisture. 
