Mushroom compost is an organic residue that used as an ecological procedure for weed control. In order to study the impacts of different mushroom levels on weed density, population and biomass in saffron field, an experiment was performed based on randomized complete block design with three replications at the Research Greenhouse in College of Agriculture, Ferdowsi University of Mashhad, Iran, during two growing seasons of 2009-2010 and 2010-2011. Treatments were zero, 60 and 120 ton mushroom compost per ha-1. Weed sampling was conducted at the vegetative stage of saffron (leaf emergence) in the second year. The results indicated that the highest relative density of weeds was observed for bind weed (15.12-43.75%) and the lowest was for redroot pigweed (8.14-25.00%). By increasing mushroom compost amount from zero to 120 t.ha-1 weed density and biomass were declined up to 91.3 and 81.4%, respectively.

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