BULLETIN 135 ; U. S. DEPARTMENT OF AGRICULTURE. 



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 which 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. 



Cultivated 



60 

 50 



0.23 

 .65 



0.28 

 .92 



0.39 

 1.54 



0.32 



1.16 



0.85 

 1.83 



0.58 

 1.49 



1.31 

 2.08 



1.29 

 1.79 



0.94 

 1.71 















.42 .64 



1.15 



.84 



.98 



.91 



.77 



.50 















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 grovm 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 hi 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. 



