CHLORSULFURON USE IN BARLEY AND RESIDUAL EFFECT ON POTATO AND RUTABAGA GROWN IN ROTATION

Abstract

Experiments were conducted over 4 yr (1980–1983) to determine the efficacy of chlorsulfuron for use on spring barley (Hordeum vulgare L.) and effects of herbicide residue on crops grown in rotation. Barley cv. Volla tolerated chlorsulfuron at rates up to 72 g a.i. ha−1 with no significant yield reductions being noted. Lamb’s-quarters and corn spurry were controlled at applied rates of 9–18 g a.i. ha−1 but 36 g a.i. ha−1 were needed to control wild buckwheat. Rotation crops of rutabaga and potato, grown the season after chlorsulfuron use, showed no adverse effects on marketable or total yield. It was estimated from corn root bioassay studies that applied rates of chlorsulfuron of up to 10 g a.i. ha−1 would not carry over into the next season under P.E.I. conditions.Key words: Chlorsulfuron, barley, potato, rutabaga, persistence