Competition between roots and microorganisms for nitrogen: mechanisms and ecological relevance.

By Y. Kuzyakov, Xingliang Xu. New Phytologist, 2013

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Viruses in soil: Nano-scale undead drivers of microbial life, biogeochemical turnover and ecosystem functions (2018, background): “Microorganisms are very strong competitors for N (Kuzyakov and Xu, 2013), and rapidly immobilize N around growing, C-releasing roots.”
Substrate quality affects kinetics and catalytic efficiency of exo-enzymes in rhizosphere and detritusphere (2016, background): “We suggest that a reduced rhizodeposition in 10e20 cm ‒ and thus less EOC and EN ‒ promotes substrate competition between microbes and plants (Fontaine et al., 2003; Kuzyakov and Xu, 2013; Blagodatskaya et al., 2014b).”
The Interactions of Rhizodeposits with Plant Growth-Promoting Rhizobacteria in the Rhizosphere: A Review (2019, background): “[64] reported that rhizodeposits supply energy to soil microbes for solubilization of organic nitrogen and other nutrients in soil organic matter.”
The Role of Soil Microorganisms in Plant Mineral Nutrition—Current Knowledge and Future Directions (2017, background): “However, it is still generally accepted that microbes are better competitors for these nutrients due to the low diffusivity of organic-N molecules in soil, and the results of isotope labeling studies generally support the concept that most organic-N is first assimilated by microbial taxa, then subse”