Effect of application ratio and rimsulfuron, oxadiargyl and metribuzin combination application time on weed biomass and tuber yield of potato (Solanum tuberosum)

To evaluate the effect of rimsulfuron and oxadiargil and also rimsulfuron and metribuzin combinations on weed biomass and tuber yield of potato, a factorial experiment based on a randomized complete block design with 3 replications performed in 2016. Factors consisted of herbicide mixture ratio (0:100, 25:75, 50:50, 75:25 and 100:0), herbicides time of applications (pre-plant and potato emergence stages) and herbicide mixture of rimsulfuron and oxadiargyl and also rimsulfuron and metribuzin. In all treatments, a weedy plot as semi control and a weed free plot as control were considered. Results showed that the maximum reduction percentage of total dry weight of weeds obtained in 25% oxadiargyl + 75% rimsulfuron and also 25% metribuzin + 75% rimsulruron at potato emerge stage. Also, after weed free treatment which increased total potato tuber yield compared to herbicide mixtures by 1.33%, the maximum total potato tuber yield obtained from 25% oxadiargyl + 75% rimsulfuron at pre-plant stage witch increased 69/16% total tuber yield of potato compared to weedy control.