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Table 2. (Cont.) <br />5011 parameter Unlt Procedure Instrumentation References <br />Nitrate (N03-N) ppm(p9/g} Specific-ion Fisher Accumet 420 nitrate <br /> electrode electrode <br />Nigro9en (N) Y Nlcro-Kieldahl Sargent-Welch recording <br /> titrator <br />Phosphorus (P) ppm(u9/9} Anmonium nwlybdate Coleman linear spectro- <br /> photometer <br />Potassium (K) ppm(ug/g) Vacuum extract Perkin-Elmer 5000 <br />Atomic absorption <br />Zinc (Zn) ppm(ug/9) DTPA extraction <br /> Atomic adsorption <br />Iron (Fe) ppm(pg/g) DTPA extraction <br /> Atanlc absorption <br />Copper (Cu) ppm(yg/g) DTPA extraction <br /> Atomic absorption <br />Manganese (Mn) ppm(u9/g) DTPA extraction <br /> Atomic absorption <br />Cadmium (Cd) ppm(u9/g) DTPA extraction <br /> Atomic absorption <br />Lead (Pb) ppm(ug/g) DTPA extraction <br /> Atomic absorption <br />Fla:.riGa (F) ppa,(uviyj Tocai speurtc- <br /> iron electrode <br />Perkin-Elmer 5000 <br />Perk.ln-Elmer 5000 <br />Perkin-Elmer 5000 <br />Perkin-Elmer 5000 <br />Perkin-Elmer 5000 <br />Perkln-Elnter 5000 <br />Fisher Accumet 420 Orion <br />fluoride :lectrode <br />Onken-Soil Science 6 Plant <br />Analyses (1) 1970, pp. 155-161. <br />ASA, Monogr P9, p. 1196. 1965. <br />USDA Circular 939:1-19. <br />Extraction-USDA Handbook 6D, <br />p. 84. Analyses - AA. <br />Agr. Abs., pp. 84, 1969. <br />Analyses - AA. <br />Agr. Abs., pp. Bq, 1969. <br />Analyses - AA. <br />Agr. Abs., pp. 84, 1969. <br />Analyses - AA. <br />Agr. RVs., pp. 84, 1969. <br />Analyses - AA. <br />Appl. Spectroscopy, pp. 456- <br />960. Analyses - AA. <br />Appl. Spectroscopy, pp. 456- <br />460. Analyses - AA. <br />J. Soil Scl, Vol. 22, /2, pp.210- <br />221, 1971. Fluoride Electrode <br />Manual- Corning. <br />r <br />N <br />