SCANNING ELECTRON MICROSCOPE (SEM) OBSERVATIONS OF SOIL STRUCTURE CHANGES INDUCED BY SODIUM-CALCIUM EXCHANGE IN RELATION TO HYDRAULIC CONDUCTIVITY

Direct SEM observations indicate that reduction in hydraulic conductivity of soils leached with mixed NaCl-CaCl2 solutions of low electrolyte concentrations are related to fine particle dispersion and the formation of a more continuous network of these particles at higher SAR values. This causes blockage of the larger pores in the soil and reduces the rate of water flow by increasing the proportion of small size pores. The changes in a sandy and in a clayey soil were quite similar. Dispersion of the fine particles seems to start at low SAR values (less than 8), but the formation of the network becomes apparent only at SAR greater than 16. /Author/

• Corporate Authors:

  Lippincott Williams & Wilkins

  428 East Preston Street
  Baltimore, MD  United States  21202
• Authors:
  • Cher, Y
• Publication Date: 1975-12

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 428-436
• Serial:
  • Soil Science
  • Volume: 120
  • Issue Number: 6

Subject/Index Terms

• TRT Terms: Calcium; Cation exchange; Clay; Concentration (Chemistry); Electrolytes; Electron microscopes; Percolation; Permeability; Permeability coefficient; Porosity; Sand; Sodium; Soil structure; Soils
• Uncontrolled Terms: Concentration
• Old TRIS Terms: Dispersion; Soil permeability; Soil porosity
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00129032
• Record Type: Publication
• Files: TRIS
• Created Date: Mar 10 1976 12:00AM