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.~ <br />~COl~J9ENDED METHODS FOR SOIL ANALYSIS <br />Topsoil <br />Reported As <br />Recommended Procedure <br />pH Hydrogen ion acts vity at USDA Handbook 60, method (21a), <br /> saturation (paste) Page 102 <br />Conductivity mmhos/cm @ 25° C USDA Handbook 60, method (3a), <br /> Page 89 and method (9b), page 89-90 <br /> or ASA Mono. No. 9, Part 2, <br /> page 937-940. 1/ <br />Saturation Percent ~ USDA Handbook 60, method (27a 6 b) <br />Percentage page 107 <br />Particle X clay, silt, sand and ASA Mono. No. 9, Page 1, method <br />Size very fine sand 93-5, page 562-56 6. Sieve <br />Analysis (vfs = 0.05-O.lmm) analysis for vfs (140-270 mesh) <br />Texture <br />Soluble Ca, <br />Mg and Na <br />Sodium <br />absorption <br />ra ti o <br />Selenium <br />USDA Textural Class USDA Handbook 18, page 205-223 <br />meq/1 Extraction of Ca, Mg and Na by <br />USDA Handbook 60, method (3a), <br />page 84. Analysis by atomic <br />absorption spectrophotometry. <br />SAR calculated from ~ USDA Nabook 60, page 26 <br />soluble Ca, Mg & Na <br />concentrations <br />ppm to a lower detection Hot water extract - sum of water <br />limit of 0.02 soluble selenate, selenite and <br /> organic Se. extraction Procedure- <br />~ A.S.A. Monograph No. 9, Part 2, <br /> 80-3.2.2 p. 1222. Analysis of <br /> extract by sodium borohdride method, <br /> Advances in Vapor Generation, 1974 <br /> presented at Silver Anniversary, <br /> Pittsburgh Conference on Analytical <br /> Chemistry and Applied Spectoscopy, <br /> Cleveland, Ohio <br />-cont'd- <br />