Clover cover crops under-sown in winter wheat increase yield of subsequent spring barley—Effect of N dose and companion grass

By G. Bergkvist, M. Stenberg, Johanna Wetterlind, B. Båth, Sara Elfstrand. 2011

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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): “Up to a 30% increase in the yield of the following maize crop has been shown to be positively correlated with the development of legumes and N accumulation in legume tissues (Amossé et al., 2014; Bergkvist et al., 2011).”
Relay-intercropped forage legumes help to control weeds in organic grain production (2013, background): “It was shown that under conventional conditions, relayntercropped red clover reduced weed development or density ignificantly (Bergkvist et al., 2011; Blaser et al., 2006, 2011; Mutch t al., 2003).”