Soybean Cultivar Differences in Ureides and the Relationship to Drought Tolerant Nitrogen Fixation and Manganese Nutrition

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Drought stress induced changes in some organic substances in nodules and other plant parts of two potential legumes differing in salt tolerance (2005, background): “In addition, large nodules have a relatively greater proportion of N2-fixing tissue than small nodules ( Purcell et al., 1997, 2000; Serraj and Sinclair, 1998).”
Soybean N2 fixation estimates, ureide concentration, and yield responses to drought (2004, background): “…requires Mn2 as a a greater depletion of N fertilizer from the soil due to cofactor, and in many soybean cultivars, Mn2 appears crop utilization and/or leaching. to be limiting or is unavailable for optimum ureide Although there was no significant interaction be- breakdown (Purcell et al., 2000).”
Drought tolerance and yield increase of soybean resulting from improved symbiotic N2 fixation (2007, background): “However, KS4895 does not possess NFDT (Purcell et al., 1997, 2000).”