AbstractThe persistence of tralkoxydim herbicide in wheat crop and in soil was evaluated under Indian sub‐tropical field conditions at two application rates (400 g a.i ha−1and 800 g a.i ha−1). At 400 g a.i ha−1, tralkoxydim persisted up to 28 days in soil but became non‐detectable only after 45 days in the crop. However, at 800 g a.i ha−1, tralkoxydim residues persisted for 45 days in both soil and crop. The dissipation of the herbicide from both soil and crop appeared to occur in two phases at both rates of application. Each phase followed first‐order kinetics. The values of DT50and DT90for both soil and crop