Nitrogen (N) must be managed efficiently to reach profitability while limiting N losses to the environment. The late-season corn stalk nitrate test (CSNT) is a reliable evaluation tool for measuring corn N status and understanding of how N management practices perform at the field scale. The CSNT measures the nitrate (NO3−) concentration in the above-ground portion of cornstalks, which can be collected up to three weeks after black layer formation. Numeric results are usually interpreted into four N sufficiency categories: deficient, marginal, optimal, and excessive.
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