Nitrogen recycling and fixation

ciclo biogeoquímico colombia composición aproximada crop residues cycling feed crops grassland management hojarasca ley farming manejo de praderas manihot esculenta materia orgánica mixed pastures organic matter oryza sativa pastizal mixto plant litter plantas forrajeras proximate composition residuos de cosechas sabanas soil chemicophysical properties tropical zones zea mays zona tropical