effect of tillage in day or night and application of reduced dosage of imazethapyr and trifluralin on weed control, yield and yield components of chickpea

this experiment was arranged as a strip-plot on the base of a completely randomized block design with three replications to study the effect of tillage (whether in day or night or in day by light-proof cover) and application of reduced dosage of imazethapyr and trifluralin on weed control, yield and yield components of chickpea. main plots consisted of tillage methods and subplots consisted of trifluralin (at doses of 480, 960 and 1440 g ai /ha) and imazethapyr (at doses of 50, 100 and 150 g ai /ha), plus weed free and weedy checks. results showed weed biomass in day tillage, night tillage and in light-proof cover tillage were respectively 86, 127 and 148 g m-2. therefore tillage at night or by light-proof cover in day time showed not enough efficiency in weed control. weed biomass increased when application dose of herbicides decreased. chickpea grain yield showed significant differences when different doses of herbicides applied. the minimum and the maximum seed yield were obtained respectively in weed free (by 208 g m-2) and weedy checks (by 123 g m-2). reduced dosage of imazethapyr and trifluralin could control weeds good enough by no significant decrease in chickpea yield. efficacy of imazethapyr to control weeds grown in chickpea was significantly better than that of trifluralin