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• <br />horizons (C1, C2, and so forth) were subdivided such that individual samples did not represent greater <br />than about 18 inches of soil material. <br />TABLE 2.04.9-1 <br />PARAMETERS AND ANALYTICAL PROCEDURES UTILIZED FOR TOPSOIL ANALYSIS <br />Parameter-Units <br />Sample Prepamdon <br />Samples were air dried at less than 35° c. Clads were broke up prior to <br />grinding and sieving of samples. large coarse fragments were removed. <br />Sample material was sieved. Remaining rock coarse fragments lefton the <br />10 mesh (2 mm) sieved were removed. Remaining soil clods left on the 10 <br />mesh screen were ground until the sample just passed the screen. <br />Excessive grinding of sample material was avoided during me entire <br />sample prepam6'on procedure. <br />USDA Handbook 60, 1954 Diagnosis and Improvement of Saline and <br />Alkali Soils. pp. 63-84. U.S. Salinity Laboretory Staff. <br /> <br />Subsampling of sieved (less than 2 mm) soil matedals for analysis <br />Coarse fragment content, percent by weight <br />PH <br />Condudivky in mmhos/cm ~ 25° C <br />Preparation of saturation eztrad and saturation percent determination <br />Particle-Size Analysis in Percent clay. silt, sand, and very tine sand <br />(vfs= 0.05-0.imm) <br />USDA Handbook 436, Soil Taxonomy. App. 1, pg. 472; Soil Survey <br />Laboratory Mathotls antl Procedures for Collecting Soil Samples, page 9 <br />antl 12-13. <br />USDA Handbook 60, Method {21 A), page 102, and page 84: Method (2). <br />USDA Handbook 60, Method (3a), page 84, and Method (4b) page 89-90. <br />USDA Handbook 60, Methotls 2 and 3a, pages 84 and 88, and 27a an0 <br />b, page 107. <br />Hydrometer Mehod. ASA Mono. No. 9, pad. 1, Method 43.5, pages 562- <br />566. Two hour and 8-hour settling times were used for clay. Sieve <br />analysis used for vts (140-270) mesh. ASA Mono. No. 9, Pan 1 pages <br />554-55fi. Black, 1965 and 1982. <br />USDA Handbook 18, pages 205-223. <br />Texture <br />Soluble Ca, Mg, and Na, meq/1 <br />Sotlium-Adsorption Ratio <br />Carbonates, Percent <br />Organic Matter, Pemnt <br />Procedures-Reference <br />(REVISED 2/00) <br />Extraction of Ca, Mg, and Na py USDA Handbook 60, Method (3a), page <br />84. Analysis by atomic adsorption spectrophotometry. <br />USDA Handbook 60, page 2fi. <br />USDA Handbook 60, Method (23c), page 105 <br />A.S.A. Monograph No. 9, 1982, Pan 2, Method 29-3.5.2, page 570. <br />2.04.9-6 <br />