Analysis of partialreturns by year and location revealed: (i) no consistent optimal MG choice under irrigated conditions; (ii)that irrigated soybean always outperformed non-irrigated production; and (iii) that non-irrigated MG Vsoybean had higher yields than earlier MG. Further, WUE, averaged across location and study years, washighest for MGs II and III with less loss in yield potential with restricted irrigation compared to MG IVand V.