End-of-season stalk nitrate testing can help you measure whether your crop received adequate nitrogen. The test measures the amount of nitrogen returned to the stalk after grain fill. Therefore, if your corn stalk ends the season with adequate nitrate, then you know nitrogen sufficiently flowed from the seed, to grain and back to stalk.
When to Sample
How to Sample
*Universities have published different NO3 levels as as low, adequate and excessive levels.