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Table 2.04.9 -1: Parameters and Analytical Procedures Utilized For Topsoil Analysis <br />Parameter -Units <br />Procedures - Reference <br />Sample Preparation <br />Samples were air dried at less than 35 c. Clods were broke <br />up prior to grinding and sieving of samples. Large coarse <br />fragments were removed. Sample material was sieved. <br />Remaining rock coarse fragments left on the 10 mesh (2 mm) <br />sieved were removed. Remaining soil clods left on the 10 <br />mesh screen were ground until the sample just passed the <br />screen. Excessive grinding of sample material was avoided <br />during the entire sample preparation procedure. <br />Subsampling of sieved (less than 2 mm) soil materials for <br />USDA Handbook 60, 1954 Diagnosis and Improvement of <br />analysis <br />Saline and Alkali Soils. pp. 83 -84. U.S. Salinity Laboratory <br />Staff <br />USDA Handbook 436, Soil Taxonomy. App. 1, pg. 472; Soil <br />Coarse fragment content, percent by weight <br />Survey Laboratory Methods and Procedures for Collecting <br />Soil Samples, page 9 and 12 -13. <br />pH <br />USDA Handbook 60, Method (21A), page 102, and page 84: <br />Method (2). <br />Conductivity in mmhos /cm @ 25° C <br />USDA Handbook 60, Method (3a), page 84, and Method (4b) <br />page 89 -90. <br />Preparation of saturation extract and saturation percent <br />USDA Handbook 60, Methods 2 and 3a, pages 84 and 88, <br />determination <br />and 27a and b, page 107. <br />Particle -Size Analysis in Percent clay, silt, sand, and very fine <br />Hydrometer Method. ASA Mono. No. 9, part. 1, Method 43 -5, <br />sand <br />pages 562 -566. Two hour and 8 -hour settling times were <br />(vfs= 0.05 -0.1 mm) <br />used for clay. Sieve analysis used for vfs (140 -270) mesh. <br />ASA Mono. No. 9, Part 1 pages 554 -556. Black, 1965 and <br />1982. <br />Texture <br />USDA Handbook 18, pages 205 -223. <br />Soluble Ca, Mg, and Na, men /1 <br />Extraction of Ca, Mg, and Na by USDA Handbook 60, Method <br />(3a), page 84. Analysis by atomic adsorption <br />spectrophotometry. <br />Sodium- Adsorption Ratio <br />USDA Handbook 60, page 26. <br />Carbonates, Percent <br />USDA Handbook 60, Method (23c), page 105 <br />Organic Matter, Percent <br />A.S.A. Monograph No. 9, 1982, Part 2, Method 29- 3.5.2, page <br />570. <br />Revised September 2010 (PR 06) 2.04.9 -7 <br />