Abstarct: The weeds are a major constraint limiting crop yield in agricultural systems and in organic systems in particular. An experiment was conducted as randomized complete block design with three replications at the research field (36° 25’E, 54° 58’N, 1349 m a.s.l.) of College of Agricultural, Shahrood University of Technology in 2015. Treatments were included; weeding all season, no weeding, trifluralin according to the recommended dose (2 t.ha-1), foliar application of wheat straw extract (concentration of 50%), foliar application of wheat straw extract (concentration of 100%), the application wheat residue mixed with the soil at a rate of 2 t.ha-1, the application wheat residue mixed with the soil at a rate of 4 t.ha-1, the application wheat residue mixed with the soil at a rate of 8 t.ha-1, foliar application of barley straw extract (concentration of 50%), foliar application of barley straw extract (concentration of 100%). Results showed that a significant difference was observed between treatments for plant height, leaf area index, number of branches, height of the first pod insertion, relative water content, chlrophyll content, stem and leaf dry weight, protein percent, number of pod, 100-seed weight, grain yield and biological yield. The results indicated that soil incorporation of wheat residue at a rate of 8 t.ha-1 decreased weeds density and increased seed number per pod, biological and grain yield of cowpea than non-weeding treatment significantly. Seed number per pod, biological and grain yield of cowpea significantly increased in soil incorporation of wheat residue at a rate of 8 t.ha-1 treatment in comparison to control treatment. Our results showed that weeding and soil application of wheat residue at a rate of 8 t. ha-1 treatments increased cowpea yield by 78.23 and 80.79% than non- weeding treatment respectively. The results indicated that no significant difference in weed density was observed between foliar application of barley extract and wheat residue application (8 t.ha-1) with trifluralin herbicide. treatment. baxsed on the results of this experiment, wheat straw mixed with soil, and the foliar application of barley extracts as a non-chemical management method, can effectively control weeds and increase cowpea growth and yield.