The experiment was carried out under heavy black clay soil conditions at the Instructional Farm, N. M. College of Agriculture, Navsari Agricultural University, Navsari during two successive seasons of 2007-08 and 2008-09 to study the productivity of sweet corn [Zea mays (L.) saccharata] as influenced by different plant population and weed management treatments and their effect on weed flora. Weed population and dry weight of weeds were recorded significantly the highest with plant population of 1,11,111 plants/ha. Significantly higher green cob (9.5 t/ha) and fodder (14.9 t/ha) yield with net return of Rs. 75,779/ha and benefit:cost ratio of 5.36 was produced with plant population of 1,11,111 plants/ha and remained at par with plant population of 83,333 plant/ha. Significantly the lowest dry weight of weeds (84.95, 81.98 and 83.47 kg/ha, in first, second year and in pooled results, respectively) was recorded in weed free check (W₂) and produced highest yield of green cob (10.7 t/ha) and fodder (17.1 t/ha). Application of atrazine 1 kg/ha+hand weeding at 40 days after sowing was remunerative in sweet corn as it had higher net return (Rs. 88,873/ha) and benefit:cost ratio (6.72).