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Figure 2. Reduction in leaf carbon exchange rate (CER) relative to leaf CER at high N as a function of weeks from silking for an older (‘Pride 5’) and a newer (‘NK N25-J7’) maize (Zea mays L.) hybrid exposed to (a) low N (LN), (b) HN switched to LN at 1 wk presilking (HLN1), and (c) HN switched to LN at 2 wk postsilking (HLN2). * Indicates when CER values were significantly lower (p < 0.05) under LN than under HN levels for each hybrid and moment of measurement.
