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Wheat spikes recognition results. [(A) Nitrogen-free, 0 kg⋅ha–1. A = 80.8%, n = 16, R2 = 0.23, p-value = 0.1. (B) Low-nitrogen, 225 kg⋅ha–1. A = 92.8%, n = 16, R2 = 0.71, p-value = 0.0036. (C) Normal nitrogen, 450 kg⋅ha–1. A = 93.1%, n = 16, R2 = 0.76, p-value = 0.0015. (D) High nitrogen, 900 kg⋅ha–1. A = 94.2%, n = 16, R2 = 0.79, p-value = 0.0003. (E) Mixed nitrogen, samples were mixed at four nitrogen levels. A = 83.7%, n = 64, R2 = 0.22, p-value = 0.0061].
