Release of C and N from roots of peas and oats and their availability to soil microorganisms

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Intercropping with legume for agroecological cropping systems: Complementarity and facilitation processes and the importance of soil microorganisms. A review (2017, background): “Rhizodeposition and exudation by crop roots are crucial since they provide large amounts of nutrients to microbial communities (Hinsinger et al., 2009; Wichern et al., 2007).”
Nitrogen rhizodeposition of legumes. A review (2011, methodology): “…is harvested and fed to animals, but evidence from a number of experiments using different methodologies indicates that legumes can deposit significant amounts of N in the soil during growth (Jensen, 1996a, b; McNeill et al., 1998; Khan et al., 2002a; Mahieu et al., 2007; Wichern et al., 2007a, b).”
Mechanisms of Nitrogen Use in Maize (2019, background): “Comparatively, the overall cost of reduced N fertilizer requirements for grain crops due to crop rotation with legumes is just 4% to 71% of the cost of an equivalent amount of synthetic N fertilizer [25,26].”