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Light saturated (2000 µmol quanta m−2 s−1) photosynthetic rate 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 = 8) of the means. Different letters indicate significant differences assessed by Tukey HSD test (P < 0·05) after performing three-way ANOVA with residual estimation.
