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Influence of Calcium Carbonate Content and Exchangeable Sodium‐Calcium Ratio on Consistency Constants, Residual Shrinkage, Moisture Equivalent, and Hygroscopic Coefficient of Soils
Author(s) -
McHenry J. R.,
Rhoades H. F.
Publication year - 1943
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1943.036159950007000c0007x
Subject(s) - water content , soil water , consistency (knowledge bases) , calcium carbonate , mathematics , chemistry , mineralogy , zoology , horticulture , library science , environmental science , soil science , geology , computer science , geotechnical engineering , discrete mathematics , biology , organic chemistry
"" I "HERE has been considerable study in recent •*years of the various problems concerned with alkali soils. In Nebraska there are numerous small areas of alkali soils or "slick spots." A recent study (6) has shown that the poorer physical condition of these slick spots is associated with a higher percentage saturation of sodium and potassium than that in the adjoining normal soils. Some observations indicated that these alkali soils, when calcareous, had even more undesirable physical properties. In soils of high clay content the effect of exchangeable sodium and potassium was more noticeable than in soils of low clay content. The following study was undertaken to ascertain the effects of changing the ratio of exchangeable sodium to calcium and the result of varying the calcium carbonate content on the following soil properties : Lower plastic limit, liquid limit, plasticity index, scouring point, residual shrinkage, moisture equivalent, and hygroscopic coefficient. Two soils were selected for the study, one with a moderately low, the other with a moderately high clay content.