Corn plants need adequate nitrogen (N) at all stages of growth to attain their yield potential. Meeting N requirements can be a management challenge when weather conditions promote losses of N early in the season and high plant demand for N later in the season. Chlorophyll meters can be used to detect deficiencies in N at any stage of growth. These meters are hand-held devices that measure the plant greenness when clamped on leaves. N-deficient plants have low concentrations of chlorophyll and, therefore, less greenness.
Iowa State University
Zhang, Jun and Blackmer, Alfred M., "Monitoring nitrogen deficiencies in corn" (1999). Integrated Crop Management News. 2197.
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