Response of Rotational Crops to Soil Residues of Chlorsulfuron

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Abstract
The response of corn (Zea mays L. ‘Sokota TS 46’), flax (Linum usitatissimum L. ‘Culbert 79’), grain sorghum [Sorghum bicolor (L.) Merr. ‘Sokota 466’), soybeans [Glycine max (L.) Merr. ‘Corsoy 79’], and sunflowers (Helianthus annuus L. ‘Sokata 4000’) to soil residues 12 and 24 months after application of 17, 34, and 68 g ai/ha chlorsulfuron {2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl) amino] carbonyl] benzenesulfonamide} was determined at two locations, Redfield and Watertown, in eastern South Dakota. All crops at Redfield were injured significantly at 17 g/ha, 12 months after application as determined by plant dry weight and visual evaluations. Corn and sorghum were the most susceptible while flax was the least susceptible. Injury at Watertown was significantly less than at Redfield. Differences in carryover were related to a lower soil pH at Watertown.