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Root architecture of the two cultivars under different N treatments. The three treatments contained the same amount of N (15 mmol/L). Different letters at the top of the histogram bars denote significant differences among treatments for the same cultivar (p < 0.05); asterisks (*) at the top of the histogram bars denote significant differences between cultivars in the same treatment (p < 0.05); vertical bars indicate the SD (n = 5).
