| Test | Procedure | Reference |
|---|---|---|
| Standard Soil Test | ||
| Organic Matter | Walkley - Black | 6 |
| pH | Saturated Paste | 2 |
| Salts | Solution conductivity | 2 |
| Phosphorus | Olsen | 3 & 7 |
| ESP | SAR Estimation | 2 |
| Texture | By Feel | 10 |
| Potassium (K) | ICP, 1:5 H20 Extract | 1 |
| Nitrate - Nitrogen (NO3) | Cadmium Reduction Column | 3 & 4 |
| Fertitility Tests | ||
| Phosphorus | Olsen | 3 & 7 |
| Nitrate | Cd reduction, 1:5 H2O Extract | 4 |
| Potassium | 1:5 NH4OAc Extract | 3 |
| Nitrogen | Kjeldahl | 5 |
| Fe, Zn, Cu, and Mn | DPTA Extract | 3 |
| Organic Matter | Walkley - Black | 5 |
| Boron | Hot Water Soluble | 5 |
| Soil Characterization Tests | ||
| pH | Choice of Procedure | 8 |
| E.C. of saturated extract | Solution conductivity | 2 |
| % H2O at saturation | Drying at 110 +/- 5 degrees C | 12 |
| CaCO3 (equivalent) | Rapid titration | 5 |
| Gypsum | Acetone Precipitation | 8 |
| Mechanical Analysis | Hydrometer | 8 |
| Mechanical Analysis | Pipet | 8 |
| Extractable Cations | NH4OAc at pH 7 or 9 | 8 |
| Exchangeable Cations | NH4OAc extractable minus soluble | 8 |
| Cation Exchange Capacity | Na saturated then NH4OAc extracted | 5 |
| Extractable Hydrogen | BaCl2 - TEA Extraction | 8 |
| Extractable NH4 | 2N KCl (colorimetric) | 5 |
| Soluble ions from saturated paste extract | ||
| Saturated Paste | Deionized H2O | 2 |
| Soluble cations | ICP-ES | 4 |
| Chloride | Colorimetric | 4 |
| CO3 + HCO3 | Titration | 4 |
| Soluble Sulfate | Turbidimetric | 4 |
| Soluble Ammonium | Colorimetric | 4 |
| Soluble Boron | ICP | 4 |
| Metals | ICP | 4 |
| Miscellaneous | ||
| Grinding Soils | Stainless Steel Grinders | |
| Extractable Arsenic | NaHCO3 extract | 11 |
| Extractable Selenium | Hot Water reflux | 5 |
| Microwave digest | EPA method 3015 | 9 |
| References: | |
| 1. | Cihacek, L. J. 1983. Interpreting Soil Analysis. Cooperative
Extension Service Guide A-126.
New Mexico State University Publ. Office, Las Cruces, NM. |
| 2. | USDA Staff. 1954. Diagnosis and Improvement of Saline
and Alkaline Soils. USDA Agric.
Handb. 60. L.A. Richards.(ed.) U.S. Gov. Print. Office, Washington, DC. |
| 3. | Ludwick, A.E. and J.O. Reuss. 1974.Guide to Fertilizer Recommendations
in Colorado.
Colorado State University, Fort Collins, Colorado. (And personal communications with Albert E. Ludwick). |
| 4. | U.S. Environmental Protection Agency. 1979. Methods for
Chemical Analysis of Water and
Wastes. U.S. Gov. Print. Office, Washington, DC. |
| 5. | Agronomy Society of America. 1965. Methods of Soil Analysis.
Part 2. Chemical and
Microbiological Properties. C.A. Black (ed.) Agronomy 9, Madison WI. |
| 6. | Agronomy Society of America. 1982. Methods of Soil Analysis.
Part 2. Chemical and
Microbiological Properties, A.L. Page (ed.) 2nd Ed. Agronomy 9, Madison WI. |
| 7. | Olsen, Sterling R., C. V. Cole, Frank S. Watanabe, and L.
A. Dean. 1954. Estimation
of Available Phosphorus in Soils by Extraction With Sodium Bicarbonate, USDA Circular No. 939, U.S. Gov. Print. Office, Washington, D. C. |
| 8. | USDA-SCS Staff. 1972. Soil Survey Laboratory Methods
and Procedures for Collecting Soil
Samples. 1972. U.S. Gov. Print. Office, Washington, DC. |
| 9. | U.S. Environmental Protection Agency 1986. Test Methods
for Evaluating Solid Waste
USEPA Rep. SW-846, 3rd Ed., 1B. Laboratory Manual, Physical/Chemical Methods. |
| 10. | Thein, S. J. 1979. A Flow Diagram for Teaching Texture-by-feel
Analysis, J. Agron.
Education. 8: 54-55. |
| 11. | Wollson, E. A., J. H. Axley, and P. C. Kearney. 1971.
Correlation Between Available Soil
Arsenic, Estimated by Six Methods, and Response of Corn (Zea mays L.), Soil Sci. Soc. Amer. P. 35: 101-105. |
| 12. | American Society of Testing and Materials. 1996. Standard
Test Method for Laboratory
Determination of Water (Moisture) Content of Soil and Rock, Rep. D2216-92. In Annual Book of ASTM Standards 4.08:185-188. |