Phosphorus deficiency increases the argon-induced decline of nodule nitrogenase activity in soybean and alfalfa

Open-flow assays of H2 evolution in Ar:O2 (80:20, v/v) by nodulated roots were performed in situ with soybean [Glycine max (L.) Merr.] and alfalfa [Medicago sativa L.) grown in sand with orthophosphate (Pi) nutrition either limiting (low-P) or non-limiting (control) for plant growth. Nodule growth w...

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