Effect of planting patterns and component of herbicide on reduction of weeds of fields corn (Zea mays L.)

In order to study the effect of planting patterns and component of herbicide on reduction of herbicide consumption and weeds of fields corn (Zea mays L.)، an experiment was conducted in 2007 at research field of Department of Weed research، Plant Protection Research Institute، Tehran، using split plot design with 4 replications. Experimental factors were corn planting patterns in 4 different types (one row planting on each ridge with 74،000 plants ha-1 and two rows planting on each ridge with 74،000، 92،500 and 111،000 plants ha-1) in main plot and 5 components of herbicide (1- Atrazin 0. 8 K /ha plus EPTC 4L/ha، 2- Atrazin 1L/ha plus EPTC 5L/ha، 3- Atrazin 1L/ha plus EPTC 6L/ha، 4- Atrazin 1L/ha plus Allachlor 5L/ha، 5 EPTC 6L/ha) in subplot. Control plots were consist of complete weeding and none-sprayed. Results indicated that two rows planting pattern on each ridge increase yield، as the highest amount was observed in two rows planting on each ridge with 74،000 and 111،000 plants ha-1. Under all planting patterns after the complete weeding control plots، Atrazin 1L/ha plus EPTC 5، 6 L/ha and EPTC 6L/ha cause highest reduction in weed density and dry matter respectively.