2026-06-27http://hdl.handle.net/123456789/80978Limited Accessgrain legumesmaizesoybeansnitrogen fixationnitrogen fertilizerscropping systemscrop rotationleguminosas de granomaízsojafijación del nitrogenoabonos nitrogenadossistemas de cultivorotación de cultivosGrain legume rotation benefits to maize in the northern Guinea savanna of Nigeria : Fixed-nitrogen versus other rotation effectsJournal Article