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. TABLE 9-1 <br />Parameter, Procedure, and Reference List <br />Utilized for Topsoil Analysis <br />Parameter-Units Procedure-Reference <br />Sample Preparation Samples were air dried et less than 35°C. Clods were <br />broken up prior to grinding and sieving the sample. Large <br />rock fragments were removed. Sample material was <br />sieved. Remaining rock fragments left on the 10 mesh 12 <br />mm) sieve were removed. Remaining soil clods left on <br />the 10 mesh screen were ground until the sample just <br />passed the screen. Excessive grinding of sample material <br />was avoided during the entire sample preparation <br />procedure. <br />Subsampling less than 2 mm fraction U.S. Salinity Lab 119691, Method 1 <br />Rock fragment content percent by SCS 119751, App. 1, p. 472; SCS (19821, p. 6, 19, <br />weight 20, 21, and 27. <br />Preparation of saturation extract Rhoades 119821, Method 10-2.3.1. <br />and saturation percentage <br />determination <br />pH (determination using saturated U.S. Salinity Lab 119691, Method 21 a. <br />pastel <br />M Conductivity of saturation extract Rhoades 419821, Method t0-3.3. <br />in mmhos/cm at 25° C <br />Soluble calcium, magnesium, and Rhoades 119821, Section 10-3.4 <br />sodium in meq/I <br />Sodium Adsorption Ratio U.S. Salinity Leb (19691, p. 26. <br />Exchangeable Sodium percentage U.S. Salinity Lab (79691, p. 26. <br />Organic Carbon in percent Nelson and Sommers 119621, Section 29-3.5.3. <br />Carbonate in percent U.S. Salinity Lab 119691, Method 23c. <br />Particle size analysis in percent sand, Gee and Bauder {t9861, Method 15-5. <br />silt, and clay <br />Textural classification USDA 119511, p• 209. <br />Sand Fractionation {very fine, fine, Gee and Bauder 119861, Method 15-5.2.4. <br />and medium or coarser) <br />C~ <br />11 <br />