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<br />F d L LABORATORIES, INC. <br />SOIL LABORATORY METHODS <br />u <br />7_ • <br />I <br />Parameter Reported as .Procedure <br />pH Hydrogen ion activity U.S.D.A. Handbook 60, method <br /> at saturation (paste) (21a), p. 102. <br />Conductivity mmhos(cm @ 25°C U.S.D.A. Handbook 60, method <br /> (31), p. 84 and method (4b), <br /> p. 89-90, or A.S.A. Mono. No. <br /> 9, Part 2, pp. 937-940. <br />Soluble ppm Extraction of Ca, Mg, and Na <br />Ca, Mg, d Na by U.S.D.A. Handbook 60, <br /> Method (3a) p. 84, Analysis <br /> by atomic absorption spectro- <br /> photometry. <br />Sodium- SAR calculated from U.S.D.A. Handbook 60, p. 26. <br />absorption soluble Ca, Mg, E Na <br />ratio concentrations <br />Texture U.S.D.A. textural U.S.D.A. Handbook 18, p. 205- <br /> 233. <br />Organic Percent A.S.A. Mono. No. 9, Part 2, <br />matter method 90-3, pp. 1372-1376. <br />