Vol. XXI, No. 4 
Journal of Agricultural Research 
Tabi,S I .—Effect of leaching with sodium-chlorid solution followed by water on the rate 
of percolation and the character of the percolate —Continued 
Reach¬ 
ing 
No. 
Reaching solution. 
Percola¬ 
tion rate 
per minute. 
[Salts in 
percolate 
[by bridge). 
Chlorids 
as NaCl. 
Acid Nlio 
H2SO< for 
100 cc. 
percolate. 
Character of 
percolate. 
24 
25 
26a 
26b 
26c 
27 
28 
29 
30 
31 
32 
33 
34 
35 
36 
37 
38 
39 
40 
41 
42 
43 
NaCl p. p. m. 
50,000. 
NaCl p. p. in. 
37 > 44 °- 
Cc. 
I. OO 
P.p.m. 
P. p.m. 
48, sss 
46,780 
3 2 > 77 ° 
40, 014 
Cc. 
I. IO 
Clear. 
I. 20 
Do. 
a. 364 
6 - 235 
c. 316 
. 267 
I. 40 
Do. 
r[n . 
I. 50 
Very turbid. 
do. 
I, 93 ° 
562 
19. 20 
Do. 
. .do. 
1, 37 ° 
28l 
14. 60 
Do. 
do ,. 
780 
622 
199 
12. 40 
Do. 
do . 
47 
II. OO 
Do. 
do. 
569 
506 
Trace. 
6. 40 
Turbid. 
do. 
• 154 
...do.... 
5 - 9 ° 
Do. 
do . 
486 
None. 
6. 70 
Do. 
do. 
. 160 
45 ° 
...do- 
6. 60 
Do. 
.do. 
. 142 
37 1 
...do- 
4. 60 
Do. 
.do. 
. 132 
• 154 
. 140 
37 1 
...do_ 
4. 00 
Do. 
do. 
35 ° 
...do_ 
5. 60 
Do. 
...do. 
3 M 
...do- 
5 - 40 
Do. 
do. 
• I 3 i 
. 091 
. 127 
. 800 
294 
...do_ 
4. 10 
Do. 
do. 
258 
...do.... 
3.80 
Do. 
.do. 
233 
...do.... 
3 - °4 
Do. 
. .do. 
!95 
...do- 
3 - 40 
Do. 
do. 
. 760 
• 530 
133 
...do... . 
2. 40 
Do. 
. .do. 
132 
...do... 
1. 40 
Do. 
& 20 CC. 
It will be observed from Table I that the percolates from the first dis¬ 
tilled water leachings showed a slight whitish turbidity. This disap¬ 
peared after the leachings with the salt solutions were begun, but the 
percolate became very turbid when water was again used after the salt 
solutions. The first distilled water leachings gave some alkalinity in the 
percolates; but this became less and continued very slight, with one ex¬ 
ception, until the strongest salt solutions were used. With leaching No. 
26, the first with distilled water after the salt solutions, a marked change 
took place. The first part of the percolate from this leaching differed 
little from the preceding, but the latter part was very turbid and strongly 
gllralinp- The exception as to alkalinity noted above is seen in perco¬ 
late No. 14. This may be explained by the fact that leaching No. 13 
was made on Saturday and No. 14 was made on the following Monday. 
Although the salt solution used for No. 14 was somewhat stronger than 
the preceding, evaporation from the tube had been sufficient, apparently, 
to make the concentration of the soil solution stronger than the concen¬ 
tration of the leaching solution. Similar results have been noted where 
leachings have been made with solutions of constant strength but with 
intervals between the successive leachings during which the soil was 
allowed to dry out. 
