Soybean N2 fixation estimates, ureide concentration, and yield responses to drought

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Soybean response to nitrogen application across the United States: A synthesis-analysis (2018, background): “For example, it has been reported that soybean yield response to N fertilizer can be amplified by dry soil’s negative effect on N fixation (Purcell et al., 2004; Ray et al., 2006).”
Nitrogenase activity, nitrogen content, and yield responses to glyphosate in glyphosate-resistant soybean (2007, background): “Soybean nitrogen fixation is more sensitive to drought compared to assimilation of inorganic soil nitrogen ( Purcell et al., 2004 ).”