s 
BULLETIN 135, U. S. DEPAKTMENT OF AGBICULTUKE. 
A summary of these determinations is given in Table II, which 
shows the average salt content to a depth of 4 feet in 1913. The 
results are expressed in percentage of air-dry soil. 
Table II.- — Average total salt content of soil to a depth of 4 feet on plats ivhich had received 
treatment according to the first method and of adjacent virgin soil. 
Soil. 
Num- 
ber of 
borings. 
Top 3 
inches. 
3 to 6 
inches. 
6 to 12 
inches. 
Aver- 
age, 
first 
foot. 
12 to 24 
inches. 
Aver- 
age, top 
2 feet. 
24 to 36 
inches. 
36 to 48 
inches. 
Aver- 
age, top 
4 feet. 
60 
50 
0.23 
.65 
0.28 
.92 
0.39 
1.54 
0.32 0.85 
1.16 J 1.83 
0.5S 
1.49 
1.31 
2.08 
1.29 
1.79 
0.94 
1.71 
.42 
.64 
1.15 
.84 
.98 
.91 
.77 | -50 
.77 
1 
The average difference between the total salt content of the first 4 
feet of cultivated soil and that of virgin soil is shown by Table II to 
Fig. 4.— Rye in field M-II on June 13, 1912. This was the second crop of rye grown on this land and was 
much more uniform than the first crop. 
have been 0.77 per cent. The largest differences occurred in the first 
and second feet. The differences are sufficient to show that the treat- 
ment given the soil has been decidedly beneficial in reducing the salt 
content. 
It was noted that the soil of plat 2, which was subsoiled in June, 
1911, contained somewhat less salt in 1913 than the plats which had 
not been subsoiled. The average salt content of the soil of five plats 
which received treatment according to the first method and which 
were sampled for total salt determinations in 1913 is given in Table 
III, together with the average salt content of the soil in plat 2. 
