Soil, Water and Forage Testing Services & Price List
Submitting Samples
Soil, water and plant samples should be submitted through your County Cooperative Extension Office. They provide sample bags and water bottles and handle mailing of samples to the laboratory. Your County Extension Educators can assist with proper sampling techniques, test result interpretations and recommendations.
Quality Assurance
Accuracy and quality of test results are assured through daily analysis of quality control samples, a three-step internal data review process, and participation in external certification and sample exchange programs. For detailed information regarding our quality assurance practices, call the SWFAL office.
Sample Results
Most samples are processed and analyzed within three to five working days and results are posted on the internet. Forage nitrate results are posted two days after samples are received. Charges for laboratory services are billed monthly from the office through which the sample was submitted.
Soil
Soil Fertility
Routine: $10.00
- pH and buffer Index (Sikora)
- Nitrate-Nitrogen
- Available Phosphorus Index (MIII)
- Available Potassium Index (MIII)
Subsoil Nitrate-Nitrogen: $2.00
- (with submission of surface soil)
Nitrate-Nitrogen: $4.00
Secondary Nutrients: $4.00
- Sulfate-Sulfur
- Magnesium and Calcium
Micronutrients: $4.00
- Iron, Zinc and Boron
Organic Matter: $8.00
Greenhouse Media: $20.00
(Saturated Media Extraction)
- Sodium
- Phosphorus
- pH
- Calcium
- Sulfur
- Nitrate-N
- Magnesium
- Boron
- Ammonium-N
- Potassium
- Electrical Conductivity
Soil Salinity
Salinity Management: $30.00
(1:1 extraction for diagnostic purposes)
- Sodium
- Magnesium
- Calcium
- Potassium
- pH
- Total Dissolved Solids
- Boron
- Electrical Conductivity
- SAR
- ESP
Comprehensive Salinity: $70.00
(Saturated paste extraction)
- Sodium
- Magnesium
- Calcium
- Potassium
- Chloride
- Nitrate-Nitrogen
- Sulfate
- Electrical Conductivity
- Carbonate
- Bicarbonate
- pH
- Total Dissolved Solids
- Boron
- ESP
- SAR
Soil Texture: $14.00
- Textural Class (Hydrometer Method) % sand, silt, clay
Water
Homebrewer – $21.00
- Sodium
- Sulfate
- Calcium
- Phosphorus
- Magnesium
- Iron
- Potassium
- Zinc
- Copper
- Hardness
- Manganese
- Electrical Conductivity
- pH
- Total Dissolved Solids
- Alkanlinity
- Nitrate
- Chloride
Livestock – $18.00
- Sodium
- Sulfate
- Calcium
- Chloride
- Magnesium
- Nitrate
- Potassium
- pH
- Copper
- Hardness
- Iron
- Electrical Conductivity
- Manganese
- Total Dissolved Solids
- Zinc
Household – $18.00
- Sodium
- Sulfate
- Calcium
- Chloride
- Magnesium
- Nitrate
- Potassium
- pH
- Copper
- Hardness
- Iron
- Electrical Conductivity
- Manganese
- Total Dissolved Solids
- Zinc
Irrigation – $18.00
- Sodium
- Magnesium
- Calcium
- Potassium
- Chloride
- Nitrate-Nitrogen
- Sulfate
- Electrical Conductivity
- pH
- Total Dissolved Solids
- Boron
- Hardness
- Carbonate
- Bicarbonate
- SAR
- Residual Carbonate
Additional analyses are available upon request, or check our website.
Forage and Feed
Protein Only: $8.00
- Protein & Moisture
Basic Analysis: $14.00
- Protein & Moisture
- ADF (Acid Detergent Fiber)
- TDN (Total Digestible Nutrients)
- Net Energy for: Gain; Lactation; and Maintenance
Basic Plus RFV: $20.00
- Protein, Moisture, ADF, & Energy
- NDF (Neutral Detergent Fiber)
- RFV (Relative Feed Value – for alfalfa only)
Nitrate Toxicity: $6.00
- Nitrate
- Moisture
Minerals: $15.00
- Ca, P, K, Mg, S, Cu, Fe and Zn
Plant Tissue
- TN, P, K, Ca, Mg, S, B, Cu,Fe, Mn and Zn: $23.00
Animal Waste and Compost
Test 1: $30.00
- pH, EC, Moisture, TN, C, S, P, K, Ca, Mg, Na, Cu, Zn, Mn and Fe
Test 2: $6.00
- NH4-N and NO3-N
Test 3: $8.00
- Water Soluble P
Learn More:
Soil, Water & Forage Analytical Laboratory
045 Agricultural Hall
Oklahoma State University
Stillwater, OK 74078
(405) 744-6630
Soil Testing Site