The effects of organic versus conventional farming methods in soil fertility and intercropping yields (Phaseolus vulgaris x Sorghum sp.) was studied throughout three growing seasons (1995A-1996A). The methodoly used to conduct the study was to divide the field into parcels, aplying natural vs chemical disease controls, monoculture vs intercropping and manure vs chemical fertilizers. As well as other experience carried out in 1994, neither bean growing season presented significant differences between the two agricultural systems, although the yield of sorghum in the organic farming system was superior to that of the conventional system during 1995B, probably due to edaphic effects. The Efficient Land Use Index (IET) were superior to 1 during all over the experience, showing the benefits of the intrercropping systems. There was increases on pH, exchangecationiccapacity,totalcations and total soil saturation that also increasedsoil fertility from lower to medium levels in both organical and conventional systems.