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The end of season corn stalk nitrate test is one of the few diagnostic tools available to determine if excess nitrogen was applied to corn. The methodology and interpretation of this test were highlighted in previous Michigan State University Extension articles: “End of season corn stalk nitrate test” and “End of season cornstalk nitrate test in a drought year.”
Here are some tips to the correct sampling procedure that is critical to getting reliable data from this test.
Most soil testing labs in your area will offer this test, such as A&L Great Lakes Laboratories, 3505 Conestoga Dr. Fort Wayne, IN 46808. For questions regarding shipping, cost and the test, contact your local soil testing lab or A&L Great Lakes Laboratories at 260-483-4759.
Although this test does not provide any remedy for the current year, familiarity with the data over a number of years including wet and drought years should assist producers in fine-tuning their nitrogen fertilizer practices.
Source: George Silva, Michigan State University Extension
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