The reduction of herbicide applications is a main research priority in recent years. One way to achieve this goal is by using adjuvants that can increase the efficacy of foliar-applied herbicides by reducing surface tension. Previous studies have shown that the surface tension of distilled water decreases under the influence of a magnetic field. In order to compare the effects of a magnetic field and Frigate in clodinafop-propargyl and cycloxydim in controlling wild oat and evaluating the surface tension, a dose–response greenhouse experiment was conducted by using 0, 8, 16, 32, 48, and 64 g ai ha-1 of clodinafop-propargyl and 0, 15, 30, 60, 90, and 120 g ai ha-1 of cycloxydim with Frigate and/or by passing them through a magnetic field.The magnetic field and Frigate caused a significant reduction in the surface tension of the herbicide solutions. But, Frigate was more effective in reducing the surface tension of the herbicide solutions, compared with the magnetic field. The magnetic field and Frigate increased the efficacy of clodinafop-propargyl and cycloxydim remarkably. Frigate increased the efficacy of the herbicides more than did the magnetic field.The magnetic field and Frigate collectively had more of an effect on the herbicides’ efficacy than when they were applied individually. The magnetic field and Frigate were more effective in increasing the efficacy of clodinafoppropargyl than that of cycloxydim.

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