1. Alam M, Rogers DH (1997) Tensiometer use in scheduling irrigation, report: Kansas State University Agricultural Experiment Station and Cooperative Extension Service, Manhattan, Kansas
2. ASTM D854-06 (2006a) Standard test methods for specific gravity of soil solids by water pycnometer, annual book of ASTM standards, 4.08, ASTM International, West Conshohocken, PA
3. ASTM D4254-00 (2006b) Standard test methods for minimum index density and unit weight of soils using a vibratory table, annual book of ASTM standards, 4.08, ASTM International, West Conshohocken, PA
4. ASTM D4253-00 (2006c) Standard test methods for maximum index density and unit weight of soils using a vibratory table, annual book of ASTM standards, 4.08, ASTM International, West Conshohocken, PA
5. ASTM D422-63 (2007) Standard test method for particle—size analysis of soils, annual book of ASTM standards, 4.08, ASTM International, West Conshohocken, PA