Fig. 1 Acetylene reduction activity (ARA) following allantoin application to roots. Relative ARA was normalized for activity prior to treatment and for rates of the control treatment on a given day. Data were averaged over foliar manganese-spray treatments (n.s.) and soybean cultivars (n.s.). The * indicates that rates differed significantly within a day between control and allantoin-treated plants, as indicated by an

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