effect of weeds in chickpea (cicer arientinum) yield

this experiment was conducted to determine the effect of competition between common weed in chickpea’s form in kermanshah and chickpea (cicer arietinum). it was carried out in sararood experimental station in kermanshah province in 2000. split plot factorial was considered as an experimental design that had four replications. the weeding was main factor with two different levels (whole season weeding and whole season interference), while types (two levels) and density (four levels) were confounded in subplots. this experiment shows that the competition of weeds with chickpea decrease yield in both types and all densities. however increasing the density lead to decrease of dry matter weigh of weeds, it’s the result of better competition of chickpea with weeds. in addition, in dwarf types, increasing the density result decreases the yield, in contrast in tall type the increasing of density, the decrease of yield. it is due to hear stress in flowering stage because this situation increases the percentage of the cavity pods. density, in both types, correlates negatively with seed weight, pod number in plant and straw weight. however, pod number in square meter has positive correlation with density. besides, the pod number in square meter has highest positive correlation with yield in both weeding and non-weeding treatments.