Recent studies have shown that the nitrogen (N) status of a corn crop can be assessed by measuring nitrate concentrations in the lower portion of cornstalks at the end of the growing season. This finding Jed to the development of a new tissue test that can be used to evaluate N management practices used in any field in any year. The test is called the "end-of-season cornstalk test". This pamphlet describes the test and how it should be used.
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Blackmer et al. (2000) studied this question.