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Leaf area (cm2 plant−1) production as influenced by nitrogen supply (LN and HN) and microbial symbiotic association (N, NM, NR and NMR) at two harvest intervals (T1 and T2). Vertical bars represent s.e. (n = 4) of the means. Different letters indicate significant differences assessed by Tukey HSD test (P < 0·05) after performing three-way ANOVA with residual estimation.
