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The impacts of precipitation and herbivore treatment on lucerne nodulation (A,B) and the impacts of precipitation and herbivore treatment on root N content (C) and root N concentration (D), respectively. CON were the control plants (no insects), A had aphids alone, W had weevils alone, and WA had both insects. Mean values (± SE) are shown. Bars with the same letters were not significantly different (P < 0.05).
