Effect of Oxadiargyl and Rimsulfuron Mixture on Weed Control and Tuber Yield of Potato (Solanum tuberosum L.)

To evaluate the effects of two herbicides mixures, of Oxadiargyl and Rimsulfuron on weed control and potato yield and its components, a randomized complete block design experiment with 3 replications was conducted at the Research Field of Mohaghegh Ardabili University. The factors include Rimsulfuron in 0, 12.5, 25, 37.5 and 50 gr a.i/ha and the Oxadiargyl in 0, 0.2, 0.4, 0.6 and 0.8 lit a.i/ha in 5 herbicide mixture percentage two by two (include: 0:0.8, 12.5:0.6, 25:0.4, 37.5: 0.2 and 50:0) and the second factor is different time of application of these herbicides include (preplant and potato emergence). The statistical analysis showed that interaction effect of two herbicides mixture percentage and time of application had significant effect on reduction percentage of density of Commen Lambsquare, Redroot Pigweed and Field Bindweed. In order to results herbicide mixture application improved the efficacy of each herbicide on weed control, wherby these herbicide mixture percentages reduce density of Commen Lambsquare in 75% Oxadiargyl + 25% Rimsulfuron, Redroot Pigweed in 25% Oxadiargyl + 75% Rimsulfuron  and Field Bindweed  in 100% Rimsulfuron lonely recpectively 100%, 94.67% and 59.67% in preplant stage. Interaction effect of herbicide mixture percentage on time of application had significant effect on mean of tuber weight, yield of per plant and total tuber weight. The results of total yield showed that treatment of 25% Oxadiargyl + 75% Rimsulfuron in potato emergence application by 69.16% increasment in comparison to weedy was the best recommended treatment of experiment. Also the results showed that despite increasment in enzyme activity of Catalase, this increasment hadn’t destructive effect on yield of potato, so conclude application of this herbicide mixture hadn’t any destructive effect on potato.