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<br />Table 4.4-4 <br />TECHNIQUES USED IN SOIL ANALYSIS <br />Parameter Reported as Recommended Procedure <br />pH Hydrogen ion activity U.S.D.A. Handbook 60, method (21a), <br /> at saturation (paste) p. 102. <br />Conductivity mmhos/cm @ 25°C U.S.D.A. Handbook 60, method (31), <br /> p. 84 and method (4b), p. 89-90, <br /> or A.S.A. Mono. No. 9, Part 2, <br /> pp. 937-940. <br />Soluble ppm Extraction of Ca, Mg, and Na by <br />• Ca, Mg 8 Na U.S.D.A. Handbook 60, Method (3a) <br /> p. 84, Analysis by atomic absorp- <br /> tion spectrophotometry . <br />Sodium- SAR calculated from U.S.D.A. Handbook 60, p. 26. <br />absorption- soluble Ca, Mg 8 Na <br />ratio concentrations <br />Texture U.S.D.A. textural U.S.D.A. Handbook 18, p. 205-233. <br /> class <br />Organic Percent A.S.A. Mono. No. 9, Part 2, method <br />matter 90-3, pp. 1372-1376. <br />Compiled from Table I-1: WDEQ, Guideline No. 1, revised Feb. 1980 <br />• <br />