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Testing Options
 
   

Testing Options

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Plant tissue samples come in two forms: leaf and petiole. AgSource performs analysis on both types of sample. Each AgSource Laboratories location offers unique testing packages, but not limited to the analysis listed on this page.

Leaf Analysis

  • Total Nitrogen
  • Phosphorus
  • Potassium
  • Zinc
  • Calcium
  • Magnesium
  • Sulfur
  • Manganese
  • Boron
  • Iron
  • Aluminum
  • Sodium
Petiole Analysis   
  • Total Nitrogen
  • Nitrate-Nitrogen
  • Phosphorus
  • Phosphate-Phosphorus
  • Potassium
  • Zinc
  • Calcium
  • Magnesium
  • Sulfur
  • Manganese
  • Boron
  • Iron
  • Aluminum
  • Sodium
Corn Stalk Nitrate Analysis   


WHY TEST

End of season stalk testing was developed to evaluate how well nitrogen fertilizer was utilized by the corn plant. This allows the producer to distinguish between over fertilization and fertilizing to maximize profits.

BASIS FOR TEST

A relationship between stalk nitrate concentrations and relative yields was developed from trials having rates of N fertilizer applied ranging from 0 to 300 lb. N/acre.

Corn plants with inadequate available nitrogen remove N from lower cornstalks and leaves during the grain filling period.

Corn plants with excess N for maximum yields accumulate nitrate in their lower stalks at the end of the season.

This relationship indicates that stalk N concentration can be divided into four categories for interpretation.  

Testing options are from apples to zucchini, AgSource can test a wide variety of plant tissues. Call the AgSource location nearest you to learn more.
AgSource Laboratories - Bonduel, WI715-758-2178 bonduel@agsource.com 
AgSource Laboratories - Ellsworth, IA 515-836-4444ellsworth@agsource.com 
AgSource Laboratories - Lincoln, NE 402-476-0300 lincoln@agsource.com 
AgSource Laboratories - Umatilla, OR541-922-4894 umatilla@agsource.com
   
 
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