In order to assess the effects salicylic acid (SA) on corn, weeds, and some herbicide efficiency, a factorial experiment with two factor as randomized complete block (RCB) designed with three replications was conducted research field of university of Tabriz- Iran in 2015. The first factor 10 levels including 8 herbicide treatments (Bentason, Nicosulfuron, 2,4-D + MCPA, Bromoxynil + MCPA, Rimsulfuron, Nicosulfuron + Rimsulfuron, Mesotrion + S-metolacholor + Terbuthlazine, Udosulfuron + Foramsulfuron + Tincarbason), and 2 controls treatments (weed free and weed infest), and the second factor was SA with 2 levels (0 (distilled water), and 1 mM SA). Results show that SA can increase corn leaf area, and dry weight of leaf and stem. This increase was outstanding in herbicides that could successfully control weeds. SA in weed infested treatment, increased common lambesquraters (Chenopodium album L.) density and dry weight, as the main weed species observed in the field. So in presence of weeds, SA is more benefit for weeds. Nicosulfuron was weak in weed control, and SA application increased weeds density and dry weights. Bromoxynil + MCPA, Mesotrion + S-metolacholor + Terbuthlazine, and 2,4-D + MCPA were successful herbicides in reduction weeds density and dry weight, and their efficiency was not reduced in presence of SA. Therefore, in herbicide treatments with weak efficiency in weed control, usage of SA is more benefit for weeds. According to obtained results, applying SA is not recommended with weak efficiency herbicides in weed control.
Biomass , corn yield , Density , herbicide , salicylic acid
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