May 16,1921 Quality of Irrigation Water 273 
dry and thoroughly pulverized it has the appearance of a sandy soil. In 
pot cultures, when treated with gypsum and manure, it is very produc¬ 
tive, but it has not been found possible to reclaim it completely with 
gypsum in the field. 
The results of leaching experiments with Fallon soil are shown in 
Tables III and IV. In these experiments 50 gm. of dry soil were leached 
with 50 cc. of solution followed by the same quantity of distilled water. 
In one case, Table III, the chlorids of calcium and sodium were com¬ 
pared, and in the other case, Table IV, the sulphates of the same bases 
were used. 
Table II .—Effect of calcium chlorid and of mixtures of calcium chlorid and sodium 
chlorid when followed by water on the rate of percolation and the character of the per¬ 
colate 
Leach¬ 
ing No. 
Leaching solution. 
Percolation 
rate per 
minute. 
Acid 
required to 
neutralize 
100 cc. of 
percolate. 
Character of 
percolate. 
M /6 CaClo . 
Cc. 
2.25 
2.50 
I - 58 
1.25 
Cc. 
0.8 
Clear. 
2 
Wafer . 
.6 
Do. 
3 
do . 
.5 
Do. 
do . 
1.0 
Do. 
5 
6 
do .. 
1.92 
1.41 
.8 
Do. 
do . 
.8 
Do. 
f A// 7 rn Na P.l co cc. 
| 1.28 
7 
1 M/po CaClo c;o cc . 
• 4 
Uu. 
8 
9 
10 
11 
12 
Water . 
2.57 
2.83 
2.66 
.8 
Do. 
do . 
.8 
Do. 
do . 
.8 
Slightly turbid. 
do . 
3.00 
• 5 
Turbid. 
do . 
2.78 
} 2-83 
• 7 
Do. 
(M/to NaCI 7c cc. 
13 
1 M/po CaCh 2 c cc.. 
•3 
v^iGcir • 
Wafer . 
2-59 
•65 
.62 
• 4 
Turbid. 
15 
16 
17 
« do . 
.8 
Very turbid. 
do .. 
1.2 
Turbid. 
do . 
.036 
2.8 
Do. 
Table HI. —Comparison of leaching with sodium chlorid and calcium chlorid, followed 
by water, showing the rate of percolation and the character of the percolate 
Leach¬ 
ing 
No. 
Leaching solution. 
Percolation 
rate per 
minute. 
Acid re¬ 
quired to 
neutralize 
100 cc. of 
percolate. 
Character of per¬ 
colate. 
I 
Ml 10 NaCl. 
Cc. 
2. 78 
Cc. 
3 - 5 
Turbid. 
2 
.do. 
1. 35 
i- 5 
Clear. 
3 
Water. 
. 19 
8-5 
Very turbid. 
4 
. 023 
8-5 
Do. 
c 
.do. 
. 028 
7 - 5 
Do. 
0 
I 
Ml 20 CaCl 2 . 
4 - 5 ° 
2. 0 
Slightly turbid. 
2 
.do. 
1. 72 
1. 0 
Clear. 
3 
Water . 
1. 02 
1. 4 
Whitish turbid. 
4 
.do. 
.67 
1. 0 
Do. 
5 
.do . 
• 50 
3 -o 
Do. 
