Here is a link to fall nitrate testing of your corn stalks. This is the best way to determine if you applied enough nitrogen for your crop.
http://cropwatch.unl.edu/2016/use-corn-stalk-nitrate-tests-evaluate-n-management
Here is a link to fall nitrate testing of your corn stalks. This is the best way to determine if you applied enough nitrogen for your crop.
http://cropwatch.unl.edu/2016/use-corn-stalk-nitrate-tests-evaluate-n-management