Nutritional constraints on root nodule bacteria affecting symbiotic nitrogen fixation: a review

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Role of Some of Mineral Nutrients in Biological Nitrogen Fixation (2013, unknown): “nodule function, and host plant growth [61].”
Global assessment of limitation to symbiotic nitrogen fixation by phosphorus availability in terrestrial ecosystems using a meta‐analysis approach (2013, background): “First, extreme P scarcity may disturb nodulation or nodule functioning [O’Hara, 2001] which in turn decreases plant fixation rate.”
Advances in Host Plant and Rhizobium Genomics to Enhance Symbiotic Nitrogen Fixation in Grain Legumes (2015, background): “trients on SNF has been reviewed elsewhere (O’Hara et al., 1988; Zahran, 1999; O’Hara, 2001; Weisany et al., 2013), and we provide a synthesis below.”
Factors affecting the potential contributions of N2 fixation by legumes in Australian pasture systems (2012, background): “…function There is evidence that very low concentrations of nutrients such as phosphorus (P) and calcium (Ca) in the legume rhizosphere may be limiting for rhizobial growth (O’Hara 2001), and P supply has been demonstrated to affect nodulation for several legume species (e.g. Pang et al. 2011).”
Soil amendment with biochar increases the competitive ability of legumes via increased potassium availability (2014, background): “Deficiencies in either can compromise nodule development and function (O’Hara, 2001).”