Abstarct: Nowadays weed specialists due to environmental problems and increasing weed resistance to herbicides, are looking for alternative methods for minimizing the use of herbicides and maximizing efficiency of weeds management. In this regard, the use of herbicides with low dose and increase their efficiencies can reduce their consumption. Therefore, to evaluate Interference of herbicides with salicylic acid and cocowet adjuvant on growth, yield and weed control in corn (Zea mays L.), a field experiment, as a factorial randomized complete block design with three replications, in field experiment was conducted at the department of agronomy and plant breeding of Shahrood University of Technology in 2012. Factors were including weed control method (A) at four levels, control (a1), weeding (a2), consuming 1 liter of herbicide (a3) and consuming 2 liters of herbicide (a4) as the first factor, salicylic acid (B) in two levels, taking 0.7 mM salicylic acid, (b1) and the absence of salicylic acid (b2) as the second factor and cocowet (C) in two levels, consumption of 2 liters per hectare cocowet (c1) and absence of cocowet (c2) as the third factor. treatments were performed at 6-leaf stage of corn. The results showed that the maximum length of ear, cob diameter, number of kernels per row, number of grains per ear, biological yield, grain yield and harvest index was dedicated to treatment combine weeding and the use of salicylic acid. Also consuming 2 liters of herbicide with cocowet increased ear length and number of grains per ear compared with treatment 1 liter of herbicide and consuming cocowet.The use of reduced doses of herbicide in combination with cocowet such full dose of herbicide could control population and dry weight of narrow leaves weeds and as an effective method for increasing weed control efficiency, prevented yield products decline, on the other hand reduced harmful effects of herbicide to environment. In between mixing cocowet with 1 liter of herbicide (reduced dose) could not control population and dry weight of broadleaf weeds as much as 2 liters of herbicide (full dose). Therefore it is recommended that to control all broadleaf weeds nicosulfuron herbicide in the typical amount (2 liters per hectare) should be used.