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Table 2.7-2 cont. <br />Page 2 <br />Chemical Determinations (1) Reference <br />Diethylenetriamine pentaacetic Soil Science Society of America Proceedings <br />(DTPA) Extractable Cations Vol. 35, No. 4, 1971, pp. 600-602. <br />(iron, copper, zinc, manganese) <br />Organic Matter American Chemical Society (ACS) Monograph No. <br />160, Methods for Chemical Analysis of Soils, <br />p. 475 <br />Nitrate ACS Monograph No. 160, p. 496 <br />Molybdenum, anion resin Soil Science, Vol. 100, No. 8, 1965, p. <br />extractable 309-318; except that a modified procedure <br />developed by Dr. S.R. Olsen is used to pre- <br />pare the analysis solution. This is as <br />follows: <br />1. Mix 3 to 25 g of sample (<60 mesh), 9 g <br />moist strongly basic anion -exchange resin <br />(chloride form, -20+50 mesh), and 100 ml <br />of H2O and shake for a minimum of 16 <br />. hours. <br />2. Separate the resin from the sample by <br />screening. Wash the resin with water and <br />transfer the resin to a glass container. <br />3. Leach the Mo from the resin with 50 ml of <br />2M NaCl in increments over a one-hour <br />period. <br />4. Analyze the leachate for Mo by the thio <br />cyanate procedure given in the above <br />reference. <br />Lime Requirement ASA Agronomy Monograph No. 9, method 61-2, <br />pp. 928-929. <br />Sulfide Treatise on Analytical Chemistry, I.M. Kolt- <br />hoff and P.J. Elving, eds., Pt. II, Vol. 7, <br />pp. 108-112 <br />Boron, water soluble U.S. Department of Agriculture, Agriculture <br />Handbook No. 60, p. 142, a 1 to 2 water <br />extract is analyzed. <br />cont. next page. <br />2-359 <br />