Optimized nitrogen application ameliorates the photosynthetic performance and yield potential in peanuts as revealed by OJIP chlorophyll fluorescence kinetics.

The ABS/RC, TR 0 /RC, and DI 0 /RC of DH9 (non-nodulation) demonstrated a decreasing trend with increasing N application.

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With the continued application of N, the K point of nodulating peanut varieties (NH5, XH11, and HH16) showed a trend in which it first increased and then fell, indicating that normal N fertilizer (N105) enhanced the oxygen evolving complex (OEC) activity of peanuts, while high N fertilizer (N165) damaged it.

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