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Effect of Nitrogen-deficient and Iron-deficient on Root Architecture of Young Seedlings of Malus hupehensis (Pamp)Rehd. Branching structure analysis of mongolian pine plantation Study on Plant Architecture of Cunninghamia lanceolata Based on Measured Data Effect of Nitrogen-deficient and Iron-deficient on Root Architecture of Young Seedlings of Malus hupehensis (Pamp)Rehd.