Effect of herbicides on weeds and corn yields in different tillage systems

In order to evaluate the herbicides on yield and corn components in different tillage systems in Fasa, an experiment was conducted in split plot in a randomized complete block design with three replications in two years. Main plots consisted of tillage in three levels: common tillage, low tillage and no tillage and subplots were treated with herbicides in 7 levels of Nicosulfuron in 2 concentrations of 2 and 1 liter per hectare, Furamsulfuron in 2 and 1 liter per hectare, formasulfuron + iodosulfuron in 2 Concentration was 1.5 and 0.75 liters per hectare and without herbicide as control. The results showed that the highest weed density was in conventional tillage (7.5 and 5.5 plants / m 2), and the lowest weed density in weed loss was obtained. The highest dry weight of weeds was in conventional tillage (45.3 and 36.1 g / m2), and the lowest dry weight of weeds was obtained in non-topical cultivars. Nicosulfuron at the rate of 2 liters per hectare had the greatest effect on the decrease in grass weed density, and there was no significant difference in reducing the density of broadleaf weeds herbicides among herbicides. Also, nicosulfuron had the highest effect on dry weight loss of grassleaf and broadleaf weeds (22.8 and 13.8 g / m2, respectively). The highest grain yield of corn (12 tons per hectare) was obtained from low tillage and nicosulfuron at 2 liters per hectare and the lowest grain yield (5.6 tons per hectare) was obtained in conventional tillage and non-herbicide control.