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Maize leaf physiological parameters under low (LD), normal (ND), and high density (HD) planting at 0, 10, 20, 30, and 40 d after anthesis. (A) Leaf dry mass per area (LMA), (B) leaf total chlorophyll content (Chl (a + b)) and (C) leaf nitrogen content. Means ± SD, n = 5. Different lowercase letters (a, b, c) denote statistical differences by LSD test (p ≤ 0.05) between different treatments.
