. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 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.
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 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 .65 .92 .42 .64 .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 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 Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The
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