Knowledge of the weed seed bank is crucial because it provides evidence of before management and forecasting the future weed problems (Ambrosio et al., 2004). The compositions of weed communities of agricultural lands vary greatly and are closely related to cropping history. Species composition and density are influenced by farming practices and vary from field to field and among areas within fields (Buhler et al., 1997). Seed densities in agricultural soils have been reported from near 0 to as much as 1 million seeds/m2 (Fenner, 1985). Although seed banks and weed populations are composed by many species but a few dominant species generally comprise 70–90% of the total seed bank (Wilson, 1988). These dominant species are the primary pests because they are resistant to control or adapt to the cropping system. Populations of annual weed species are perpetuated by seeds that comprise the seed bank. Seeds enter into the soil through many sources, but the major source is plants that escape control and produce seeds within the field