Abstract A greenhouse experiment was conducted to quantify the effect of soil dust on growth and yield of bean and weeds competitive balance in a replacement series based on a complete block design in Ilam in 2017. The treatments were consisted of soil dust (with and without), 2 weed species (Echinochloa crus-galli and Chenopodium album) in and mixtures of 100% crop, 75% crop+25% weed, 50% crop+50% weed, 25% crop+75%weed and 100% weed. The amou8nt of chlorophyll a, chlorophyll b and total chlorophyll leaves content, carotenoids, number of pod per plant, 1000-seed weight, seed yield were measured. The results showed that the soil dust significantly affect the crop yield and all measured characters so that the interactions among soil dust, weed species and crop-weed mixtures were statistically significant. Therefore, soil dust not only cause reduction in crop growth and yield but also may worsen the effect of weeds on the crop. Keywords: Soil dust bean weeds competition
