The Effect of Herbicides and Planting Pattern on Weeds of Maize (Zea mays L.)

This study was conducted in 2008 at the research field of University of Tehran, Karaj. The experiment was designed as a randomized complete block design with three replications. Treatments were: atrazine 1kg/ha, alachlor 4kg/ha, atrazine+alachlor (1+4) kg/ha, nicosulfuron 80 g ai/ha, furamsulfuron 45g ai/ha, rimsulfuron 25g ai/ha, nicosulfuron+furamsulfuron (80+45) g ai/ha, nicosulfuron+rimsulfuron (80+25) g ai/ha, furamsulfuron+rimsulfuron (45+25) g ai/ha, weedy and weed checks as controls. Results showed that at 15 and 30 days after treatment, maximum reduction in weed density was observed with atrazine+alachlor, atrazine and alachlor and maximum reduction in weed biomass was observed with atrazine+alachlor and nicosulfuron. The effect of plant pattern was significant on density and biomass of weeds in 30 days after treatment.