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Nitrogen (N) content in shoots (A,D), roots (B,E), and acorns (C,F) of Chinese cork oak (Quercus variabilis Blume) seedlings subjected to blue, red, and green LED spectra (n = 24) or subjected to N pulse at 120 mg 15N plant-1 (+15N) or zero (-15N) (n = 36).

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