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How To Sample

Time: 1 - 3 weeks after black layers have formed on 80% of the kernels of most ears.

Where: 8 inch segment of stalk found between 6 and 14 inches above the soil. Void damaged stalks and remove sheaths. Amount: Within an area not larger than 10 acres, fifteen 8 inch segments should be collected at randomStalkNitrate.jpg to form one composite sample to be evaluated. Areas of differing soil types or management should be sampled separately.

Shipping: Place in a paper bag (not plastic). Refrigerate if delay in shipping is one or more days. Do not freeze.

For laboratory specific information regarding plant tissue analysis, procedures, guidelines, test packages/supplies or analysis kits, please contact one of our laboratories nearest you listed below:  

Laboratory Locations:

AgSource Belmond Labs, Belmond IA 641-444-3384 belmondlabs@agsource.com
AgSource Soil & Forage, Bonduel, WI715-758-2178 aglab@agsource.com 
AgSource Harris Laboratories, Lincoln, NE402-476-0300 info@agsourceharris.com
Agri-Check, Umatilla, OR541-922-4894 dosgood@agsource.com
CRI North West Labs, Jerome, ID 208-324-7511 jamdall@agsource.com 

   
 
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