A field experiment was conducted to study the effect of post emergenceherbicides on weed growth and yield of irrigated maize at RegionalAgricultural Research Station Vijaypura, during kharif 2014. Resultsrevealed that, next to the weed free check (6.65 t ha-1), Atrazine 50%WP @ 1.0 kg a.i./ha as pre emergence followed by one hand weedingwith inter culturing at 40-45 DAS recorded higher grain yield(6.14 t ha-1) and straw yield (6.87 t ha-1) and this was followed byTopramezone 33.6% SC @ 33.6 g a.i./ha +MSO adjuvant as postemergence at 20-25 DAS due to improvement in yield attributingcharacters like cob length, cob girth and grain weight per cob. Next tothe weed free check, lower total weed population m-2 (1.73), weeddry weight m-2 (6.56 g) and higher weed control efficiency (86.88 %)were recorded with Atrazine 50% WP @ 1.0 kg a.i./ha as pre emergencefollowed by one HW with IC at 40-45 DAS and which was followedby post emergence application of Topramezone 33.6% SC @ 33.6 ga.i./ha +MSO adjuvant at 20-25 DAS ( 2.93, 9.19 g and 74.22%,respectively).