Abstract: Provided are improved agricultural processes for the improved cultivation of crops of rice varieties modified to be tolerant to imparted with resistance to imidazolinone type herbicides wherein the crops are treated to control undesired vegetative growth using a halosulfuron methyl herbicidal composition to provide improved herbicidal efficacy. Also provided are compositions useful in the improved agricultural processes, as well as herbicidal treatment regimens. Unexpectedly high rates of efficacy against one or more of Sesbania hemp (Sesbania exaltata), Indian Joint vetch (Aeschynomene indica), and Alligator weed (Alternanthera philoxeroides) amongst rice crops are disclosed.