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Impacts of CO2, temperature and aphid presence on root nodulation (number per plant) of M. sativa when growing in (A) non-supplemented and (B) Si supplemented soil. Mean values ± standard error shown (N = 20) with statistically significant effects indicated ∗P < 0.05, ∗∗P < 0.01, and ∗∗∗P < 0.001. Significant factors shown as per Figure 1 legend.
