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Proportion (A) and total amount (B) of nitrogen derived from fertilizer (NDF) allocated into different organs for N-treated trees destructively harvested at dormancy of the 2017–2018 season under different N application treatments. Error bars represent ±SEM, n = 4. For each organ, notation indicating the extent of difference between treatments from unpaired two-sample t-test: ns p > 0.05; *p < 0.05; **p < 0.01; ***p < 0.001.
