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Prompt chlorophyll a fluorescence (PF) transients of the two maize hybrids under different planting densities. (A–D): 2019 data; (E–H): 2020 data. (A,E): Absolute values of Zhengdan958. (B,F): Normalized transients of Zhengdan958, expressed as Vt = [(Ft − FO)/(FP − FO)]. (C,G): Absolute values of Xianyu335. (D,H): Normalized transients of Xianyu335, expressed as Vt = [(Ft − FO)/(FP − FO)]. Signals are plotted on a logarithmic time scale.
