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Methods

In Wisconsin, a soil testing laboratory must be certified by the Wisconsin Department of Agriculture, Trade, and Consumer Protections (WDATCP) if results are to be used in nutrient management planning or related to any government cost sharing program.  A certified testing laboratory must perform soil testing using analytical procedures as outlined by the University of Wisconsin.

Below is a listing of the soil test and approved analytical procedure used by Dairyland Laboratories, Inc.

Soil pH

Prepare a 1:1 soil to distilled water mixture and measure the pH with a glass electrode.

Laboski, C.A.M., Peters, J.B. and Bundy, L.G. 2006. Nutrient Application Guidelines for
field, vegetable, and fruit crops in Wisconsin.  UW-Extension Publication A2809.  UW-Madison Cooperation Extention Publications, Madison, Wisconsin.
    
Watson, M.E., and Brown, J.R. 1998. pH and lime requirement. pp 13-16. In J.R. Brown
(ed.), Recommended Chemical Soil Test Procedures for North Central Region, NCR Publ. No. 221 (revised). Missouri Agr. 0045p. Sta. SB 1001. Columbia, MO.

Buffer pH

Prepare a 1:1:1, soil: water: Sikora buffer mixture for soil with a pH value below 6.6 and measure the pH with a glass electrode.

Sikora, F.J. 2006. A buffer that mimics the SMP buffer for determining lime requirement
of the soil. In Soil Sci. Soc. Am. J. 70:474-486. SSSA, Madison, WI.

Phosphorus (P)

Extract with Bray 1(0.03 N NH4F in 0.025 N HCL), develop color and measure with a UV-Vis spectrophotometer.

Bray, R.H., and L.T. Kurtz. 1945. Determination of total, organic, and available
forms of phosphorus in soil. Soil Sci. 59: 39-45.
Munter, R.C. 1988. Laboratory factors affecting the extractability of nutrients. pp.
8-10. In W.C. Dahnke (ed.), Recommended Chemical Soil Test procedures for the North Central Region. NCR Publ. 221 (revised). ND Agri. Exp. Sta., Fargo, ND.
Frank, K., D, Beegle, and J. Denning. 1998. Phosphorus. pp. 21-26. In J.R. Brown
(ed.) Recommended Chemical Soil Test Procedures for the North Central Region. NCR Publ. No. 221 (revised). Missouri Agri. Sta. SB 1001. Columbia, MO.
Adapted from Olsen, S.R. and Sommers, L.E. 1982. Phosphorus. pp. 403-430 in
A.L. Page, R.H. Miller and D.R. Keeney, Eds. Methods of soil analysis. Part 2. 2nd ed. Agronomy No. 9. American Society of Agronomy, Madison, WI.

Potassium

Extract with Bray 1 (0.03 N NH4F in 0.025 N HCL) and measure with a flame photometer.

Bray, R.H., and L.T. Kurtz. 1945. Determination of total, organic, and available
forms of phosphorus in soil. Soil Sci. 59: 39-45.
Munter, R.C. 1988. Laboratory factors affecting the extractability of nutrients. pp.
8-10. In W.C. Dahnke (ed.), Recommended Chemical Soil Test procedures for the North Central Region. NCR Publ. 221 (revised). ND Agri. Exp. Sta., Fargo, ND.

LOI Organic Matter (OM)

Loss of weight on ignition at 360oC for 2 hours. OM = 0.07 0.89 (LOI)b.

Combs, S.M. and Nathan, M.V. 1998. Soil organic matter. pp. 57-58. In  J.R. Brown (Ed.),
Recommended Chemical Soil Test Procedure for the North Central Region. NCR Publ. No. 221 (revised). Missouri Agri. Exp. Sta. SB 1001. Columbia, MO.

Calcium (Ca)

Extract with ammonium acetate solution (1 N NH4OAc, pH 7.0) and measure with an ICP.

Magnesium (Mg)

Extract with ammonium acetate solution (1 N NH4OAc, pH 7.0) and measure with an ICP.

Manganese

Extract with 0.1 N H3PO4 and measure with an ICP.

Hammes, J.K., and K.C. Berger. 1960. Soil Sci. 90:239-244.
Randall, G.W., E.E. Schulte, and R.B. Corey. 1976. Correlation of plant manganese with
extractable soil manganese and soil factors. Soil Sci. Soc. Am. J. 40:282-287.  
Whitney, D.A. 1998. Micronutrients: Zinc, iron, manganese, and copper. pp. 41-44. In J.R.
Brown (ed.), Recommended Chemical Soil Test Procedures for the North Central Region. NCR Publ. No. 221 (revised). Missouri Agr. Exp. Sta. SB 1001. Columbia, MO.

Zinc

Extract with 0.1 N HCL and measure with an ICP.

Whitney, D.A. 1998. Micronutrients: Zinc, iron, manganese, and copper. pp. 41-44. In J.R.
Brown (ed.), Recommended Chemical Soil Test Procedures for the North Central Region. NCR Publ. No. 221 (revised). Missouri Agr. Exp. Sta. SB 1001. Columbia, MO.

Boron

Extract with hot water boron method.  Boron in the extract reacts with the curcumin.  Concentration of boron is measured with UV-Vis spectrophotometer.

Berger, K.C., and E. Truog. 1964 Soil Sci. Soc. Am. Proc. 10:113.
Dible, et. Al. 1954. Anal. Chem. 24:418
Watson, M.E. 1998. Boron. pp. 45-48. In J.R. Brown (ed.), Recommended Chemical Soil
Test Procedures for the North Central Region. NCR Publ. No. 221 (revised). Missouri Agr. Exp. Sta. SB 1001. Columbia, MO.

Sulfur

Extract with sulfur extract (Ca(H2PO4)2H20 in 2N HOAc). Add gum Arabic in acetic acid. Concentration of sulfur is measured with a nephelometer.

Combs, S.M., J.L. Denning, and K.D. Frank. 1998 Sufate-Sulfur. Pp. 35-40. In J.R.
Brown (Ed.), Recommended Chemical Soil Test Procedures for the North Central Region. NCR Publ. No. 221 (revised). Missouri Agr. Exp. Sta. SB 1001. Columbia, MO.
Hoeft, R.G., L.M. Walsh, and D.R. Keeney. 1973. Soil Sci. Soc. Am. Proc. 37:401
404.
Hesse, P.R. 1957. The effect of colloidal organic matter on the precipitation of
barium sulfate and a modified method for determinant soluble sulfate in soils. Analyst 82:710-712.

 

For more information call Dairyland Laboratories, Inc. at 608-323-2123 or contact us here.