Looking for water, environmental or agricultural testing services with quick turnaround? We are the one-stop solution for you. Clients from Davenport to Council Bluffs rely on AgSource for quality service and accurate results. Located conveniently in central Iowa, our Ellsworth laboratory allows easy access for customers in Des Moines, Kansas City, Omaha, and Minneapolis.
Services
Analyses offered include soil, soil health, plant tissue, irrigation water, manure and soybean cyst nematode testing. Water testing is also available for drinking water, wastewater and pool water.
Benefits
The AgSource team in Ellsworth is well-versed in the agricultural and environmental fields. In addition to our extensive knowledge and experience, you’ll find that it’s easy and convenient to work with us. We offer the following benefits to our customers:
Contact Information
Ready to contact us for water, environmental, or agricultural testing services? Contact Ellsworth today!
Do you need supplies for testing? Just let us know what you are looking to test and we will send you what you need.
A: 1701 Detroit St., PO Box 247, Ellsworth, IA 50075
P: 515.836.4444
F: 515.836.4541
SOIL |
| Soil Sample Submission Form – Single Sample or GRID Samples |
| Soil Sample Submission Form – Multiple Samples |
| Soil Health Submission Form |
| Late Spring/In Season Nitrogen (PSNT) Form |
PLANT TISSUE |
| Plant Tissue Submission Form |
WATER |
| General Water Sample Submission Form – Chain of Custody Form |
MANURE |
| Manure/Compost Sample Submission Form |
Certifications
Following are the certifications we hold at our Ellsworth laboratory:
For the best use of soil testing results, it is important to know the following:
Actual nutrient availability in the soil is determined by changing factors including: soil moisture, temperature, pH, clay content, internal drainage, organic contact and physical barriers. As any of these factors change, the availability will also change.
For a printable PDF with all methods, click here.
– All soil samples are dried and ground.
Analysis | Units | Method Description |
Soil pH | — | 1:1 Soil/Water Slurry |
Buffer pH (Buffer Index) | — | Sikora Buffer Method |
Soluble Salts (EC) | mmhos/cm | 1:2 Soil/Water Slurry |
Potassium | ppm | Mehlich 3 Extraction |
Phosphorus | ppm | Mehlich 3 Extraction, Colorimetric |
Calcium, Magnesium and Sodium | ppm | Ammonium Acetate Extraction |
Sulfur | ppm | Monocalcium Phosphate Extraction |
Copper, Iron, Manganese and Zinc | ppm | DTPA Extraction |
Boron | ppm | Hot Water Extraction |
Nitrate-Nitrogen | ppm | Cadmium Reduction |
Ammonium Nitrogen | ppm | KCl Extraction |
Organic Matter | % | Loss on Ignition (LOI), expressed as OM% |
(By Request)
Analysis | Units | Method Description |
Phosphorus, Bray 2 | ppm | Bray 1 Extraction |
Phosphorus, Bray 2 | ppm | Bray 2 Extraction |
Phosphorus, Olsen | ppm | Olsen Extraction, when soil pH >7.2 |
Moist Soil K (Wet K) | ppm |
Moist soil slurry, Mehlich 3 Extraction |
Soil test methods are described in:
– Liquid and solid samples are tested as a liquid. Dry samples are dried and ground for testing. All samples are reported “As Received”.
Analysis | Units | Method Description |
Dry Matter/Moisture | % | Oven Drying at 70°C, 16 hours |
Nitrogen (TKN) | % | Total Kjeldahl Digestion |
Minerals: P, K, S, Ca, Mg, Na | % | Nitric Acid/Hydrogen Peroxide Digestion |
Minerals: Cu, Fe, Mn, Zn | ppm | Nitric Acid/Hydrogen Peroxide Digestion |
Ammonium-Nitrogen | % | KCI Extraction |
Nitrate-Nitrogen | % | KCI Extraction |
Organic Nitrogen | % | Calculated: (TKN – Ammonium-Nitrogen) |
pH | — | 1:2 Manure:Water Slurry, “As Received” |
Electrical Conductivity (EC) | mmhos/cm | 1:2 Manure:Water Slurry, “As Received” |
Manure test methods are described in:
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