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l~ <br />Table 9-6-1 <br />Parameter, Procedure, and Reference List <br />Utilized for Topsoil Analysis <br />r 1 <br />L_J <br />Parameter-Units Procedure-Reference <br />Sample Preparation Samples were air dried at less than 35°C. Clods <br />were broken up prior to grinding and sieving of <br />sample. Large coarse fragments were removed. <br />Sample material was sieved. Remaining rock coarse <br />fragments left on the 10 mesh (2 mm) sieve were <br />removed. Remaining soil clods left on the 10 mesh <br />screen were ground until the sample just passed <br />the screen. Excessive grinding of sample material <br />was avoided during the entire sample preparation <br />procedure. <br />Subsampling less than 2 mn fraction USDA (1969), Method 1, p. 83-84. <br />Coarse fragment content percent by <br />weight. <br />Preparation of saturation extract <br />and saturation percent <br />determination <br />pH (determination using saturated <br />paste) <br />Conductivity of saturation extract <br />in mmhos/cm at 25°C <br />Soluble calcium, magnesium, and <br />sodium in meq/1 <br />Sodium Adsorption Ratio <br />1 <br />Carbonates <br />Particle size analysis <br />in ~ sand, silt, and clay <br />Textural classification <br />Percent very fine sand <br />SCS (1975), App, 1, p. 472; SCS (1982), p. 6, 19, <br />20, 21, and 27, <br />USDA 11969), Methods 2 and 3a, p. B4 and 88, and <br />Methods 27a and 27b, p. 107. <br />USDA (1969), Method 21a, p. 102 and Method 2, p. <br />84. <br />USDA (1969), Method 3a, p. 84 and Method 4b, p. <br />89-90. <br />Page (1982), Section 10-3.4, Analysis by A.A. <br />Spectrophotometry, p. 173-174. <br />USDA (1969), p. 26. __ <br />USDA (1969), Method 23c, p. 105. <br />Bouyoucos (1962), calculated settling periods for <br />sand (i.e., 40 sec.) and clay (i.e., 7 hrs), <br />respectively. <br />USDA (1951), p. 209. <br />Black (1965), sieve analysis, Method 43-6.3, p. <br />564 and Method 43-4.3.4, p. 555-556. <br />• Percent organic matter Davies (1974), loss-on ignition; Page (1982), <br />Section 29-3.5.2, p. 570, Wal kley-Black. <br />Units are tons of calcium carbonate required per acre furrow slice. <br />9-6-12 <br />Revised 05/16/88 <br />