Fayetteville
Agricultural
Diagnostic
Laboratory

Analytical prices and forms for the standard procedures can be found in the pdf fillable forms located below.  Additional information on specific sample types can be accessed from the menu. Please contact the lab for the pricing and availability of analytical procedures not listed on the forms. The analytical procedures used in sample preparation and analysis are listed on the Analytical Methods & References page.

AGRI Forms

• AGRI-412 Form Forage
• AGRI-421 Price List
• AGRI-423 Form Plant Soil Diag
• AGRI-429 Form Manure
• AGRI-430 Form Growing Media
• Research Sample Analysis Form
• Strawberry Monitoring Info Form

Example Reports

• Example A Routine Forage Rpt
• Example B Routine + Extras Forage Rpt
• Manure Dry Example report
• Manure Liquid Example Report
• Sample Strawberry Monitoring Rpt

• Agricultural Laboratory Proficiency
• Agricultural Publications
• Arkansas State Plant Board – Feed and Fertilizer Division
• Minnesota Department of Agriculture
• National Forage Testing Association
• SERA-IEG-6

• Soil pH (usually 1:2 soil: water ratio, but other methods available)
• Soil electrical conductivity (usually 1:2 soil: water ratio, but other methods available)
• Mehlich-3 extraction
• Total recoverable metals by EPA 3050B
• Soil organic matter by loss on ignition
• Total soil carbon and nitrogen
• Soil inorganic nitrogen (nitrate- and ammonium-nitrogen)
• Soil texture by hydrometer
• Water-soluble chloride

The Fayetteville Agricultural Diagnostic Laboratory performs fee-based, analytical services on plant samples primarily for researchers and troubleshooting plant growth problems, but also for some nutrient monitoring programs (e.g., Strawberry Nutrient Monitoring).

The plant analysis tests most frequently performed by the Fayetteville Agricultural Diagnostic Laboratory are included in the list below and prices are provided in AGRI-423. Form AGRI-423 should be used to submit plant samples for diagnosing plant growth problems that may be caused by nutrient deficiency or toxicity. Clients interested in this service should complete form AGRI-423 with information regarding the plant traits, describe the problem, and then select the desired analyses. Research samples should be submitted using the Research Sample Analysis Form and results will be provided in an Excel file. The laboratory participates in the ALP proficiency program as part of our quality assurance and quality control program. Proficiency results are available upon request.

• Total mineral (P, K, Ca, Mg, S, Na, Fe, Mn, Cu, Zn and B) analysis by digestion
• Total nitrogen and carbon by combustion
• Plant nitrate-nitrogen
• Corn-stalk nitrate test
• Water-soluble chloride
• Strawberry monitoring program

Collecting the proper plant tissue sample and providing accurate information about plant symptoms is important for proper diagnosis of nutrient-related maladies.

• Complete all information on the sample analysis form for each sample
• Include a check for the proper amount with the sample and completed form(s).
• Samples may be delivered to the nearest county Extension office, shipped by the client, or delivered directly to the laboratory.
• Remove roots from the plant. A diagnostic analysis is performed only on aboveground tissue.
• Collecting the proper tissue is critical. The proper tissue to collect varies among plant species, size, and plant age. If in doubt, collect and submit the same tissues from both healthy and sick plants for comparison. Contact the lab or your local county Extension agent with questions about sampling protocol.
• If plant samples will be mailed, place each sample in separate labeled paper bags.
• Soil analysis is often helpful in interpreting plant tissue analysis and diagnosing growth problems.

Analysis of strawberry petioles is performed in cooperation with the Cooperative Extension Service for the Strawberry Monitoring Program.  Instructions on participating in the Strawberry Monitoring Program are included in the enrollment form.

Example Strawberry Monitoring Program Report

The Fayetteville Agricultural Diagnostic Laboratory performs fee-based, analytical services on more than 1000 dry and liquid manure samples annually for researchers and farmers to determine manure nutrient content as an aid for nutrient management. The laboratory participates in the  Manure Analysis Proficiency (MAP) program administered by the Minnesota Department of Agriculture as part of our quality assurance and quality control program. Proficiency results are available upon request.

The manure analysis tests most frequently performed by the Fayetteville Agricultural Diagnostic Laboratory are included in the list below and prices are provided in AGRI-429.  The analytical report provided to growers includes the analytical information and the equivalent nutrient content per moist and dry ton for N, P₂O₅, and K₂O (Example reports for Dry and Liquid samples). Research samples should be submitted using the Research Sample Analysis Form and results will be provided in an Excel file. The analytical information and references for the offered soil analyses can be found on the Analytical Methods page.

• % moisture or solids
• pH
• Electrical conductivity
• Primary mineral content (P, K, and Ca) analysis by digestion
• Other mineral content (Mg, S, Na, Fe, Mn, Cu, Zn and B) analysis by digestion
• Total nitrogen and carbon by combustion
• Water-extractable P (WEP)
• Inorganic nitrogen (nitrate- and ammonium-nitrogen)

The laboratory also offers growth media analysis (see form AGRI-430), sample preparation (e.g., grinding) and analytical services for samples that have been digested or extracted and need to be analyzed. Prices for most of these services are included in AGRI-421.  If the specific service of interest is not listed, please inquire via email or phone regarding availability and pricing. Clients seeking water analysis should contact the Water Resources Laboratory.

1371 W. Altheimer Drive,
DTAS Room 133
Phone: 479-502-9843
Email: awrcwql@uark.edu

TBD