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Modulated 820 nm reflection kinetics of the two maize hybrids under different planting densities. (A–B): 2019 data and (C–D): 2020 data. (A,C): Normalized values of Zhengdan958 expressed as modulated 820 nm reflection (MR)/MRO. (B,D): Normalized values of Xianyu335 expressed as MR/MRO. Signals are plotted on a logarithmic time scale. MRO is the first reliable MR measurement (taken at 0.7 ms).
