The objetives of this work were; Evaluate biodegradable materials as mulch in order to find an alternative to polyethylene (PE) with the study of weeds density and pepper crop yield. Conclusions: o Both paper and biodegradable plastic mulches are efficient as PE in weed control. o Paper films were the only materials capable of prevent nutsedge to pierce . A recommendable material in case of severe nutsedge infestations. o Total marketable yield were similar as the one obtained with PE, even higher in the case of the biodegradable plastic Mater-Bi. Any of these materials are a good alternative to PE.