The use of dose-effect curves for studying mixing effects of metribuzin with halosulfurom and flumioxazin on potato weed control

The most effective tool to prevent and delay resistance to herbicides, and increase weed control spectrum is herbicide tank mixtures. In order to evaluate the effects of binary mixtures of metribuzin:halosulfuron and metribuzin:flumioxazin on potato weeds, a field experiments was conducted in factorial experiments in a randomized complete block design in Ardabil in 2019 .The doses of metribuzin were 10.93, 21.87, 43.75, 87.5, 175, 350 and 700 g ai. ha-1 and halosulfuron doses were 0.78, 1.562, 3.125, 6.25, 12.5, 25 and 50 g ai. ha-1. The metribuzin:halosulfuron uses (100:0), (98:2), (93:7), (82:18) and (0:100)% mixture ratios with three replications. On the other hand, the doses of metribuzin were 10.93, 21.87, 43.75, 87.5, 175, 350 and 700 g ai. ha-1 and flumioxazin were 0.97, 1.95, 3.9, 7.81, 15.62, 31.25 and 62.5 g ai. ha-1. The metribuzin:f1umioxazin mixtures ratios were (100:0), (97:3),  (92:8), (79:21) and (0:100)% with three replications. The experiments were carried out on two-time levels: pre-emergence (7 days after planting) and post-emergence (75% potato emergence, 35 days after planting). The ED50 and ED90 values indicated (0:100)% metribuzin:halosulfuron and metribuzin:flumioxazin had the most effective treatment on total weed, convolvulus arvensis and setaria viridis biomass. Dose-effect curves demonstrated metribuzin:halosulfuron and metribuzin:flumioxazin followed an antagonistic effect based on the additive dose model (ADM) reference model.