MOBILITY OF 2 SULFONYLUREA HERBICIDES IN SOIL

Intact field soil cores were used to compare the mobility of DPX-A7881 [2-[[[[[4-ethoxy-6-(methylamino)-1, 3, 5-triazin-2-yl]amino]carbonyl]amino]sulfonyl]benzoate], a new sulfonylurea herbicide, and chlorsulfuron [2-chloro-N- [[(4-methoxy-6-methyl-1, 3, 5-triazin-2-yl)amino] carbonyl]benzenesulfonamide] in four soils. DPX-A7881 was generally less mobile than chlorsulfuron in soil. This was explained on the basis of the reduced water solubility of DPX-A7881 relative to chlorsulfuron (1.7 and 300 ppm, respectively, at pH 5.0). Enhanced mobility of both herbicides in soil was related to higher soil pH and low organic matter content. © 1990, American Chemical Society. All rights reserved.