اﺛﺮ رﻳﺰﮔﺮدﻫﺎ ﺑﺮ ﻛﺎراﻳﻲ ﻋﻠﻒﻛﺶﻫﺎی ﻣﺨﺘﻠﻒ در ﻛﻨﺘﺮل ﻋﻠﻒ ﻫﺎی ﻫﺮز ﺳﻮروف و ﺗﺎج ﺧﺮوس در ﻣﺰرﻋﻪ ذرت ( .Zea mays L ) در ﻣﻨﻄﻘﻪ ﻛﺮﻣﺎﻧﺸﺎه

To evaluate the effect of airborne dust of the efficacy of most important herbicide of corn field and finding the possible solution ways to overcoming the negative effects of dust a field experiment was conducted at Research farm of Razi University, Kermanshah in 2012. The evaluated treatments were using herbicide foramsulfuron, nicosulfuron and herbicidal mixture of 2, 4-D+MCPA in combination with and without adjuvants ammonium sulfate (AMS) and AMS+maisoil on weeds with washed and unwashed shoots. The experimental design was a randomized complete block in which treatments were arranged as factorial with four replication. Results of this study revealed that the presence of airborne dust of weed surfaces reduced the efficacy of foramsulfuron, nicosulfuron and herbicidal mixture of 2, 4-D+MCPA on treated weeds species. Soil dust reduced the corn yield and number of ears per plant, number of kernels per row and ear diameter. Addition of AMS to the spray solution and washing the weed shoots just before the application of treatments enhanced the activity of used herbicides. According the results of this study it would be concluded that pH of weed surface due to the presences of dust and adsorption of herbicides to soil particles are the possible mechanisms of reduction of herbicide efficacy.