A field study was conducted at Punjab Agricultural University Regional Station, Bathinda during 2005-06 and 2006-07 to evaluate the effect of different weed control treatments on germination, growth of onion seedlings and weed spectrum in onion nursery. All the treatments reduced weed growth significantly over the unweeded control except plastic mulching and oxyfluorfen at 0.062 kg/ha. Pendimethalin at all the three levels significantly reduced weed population but adversely affected the germination of onion seedlings. The most adverse effect of pendimethalin was observed at 1.0 kg/ha. However, partial control of weed was observed in case of oxyfluorfen. There was significant reduction in weight of 100 seedlings at all the oxyflourfen levels. So, pendimethalin at 0.5 kg/ha and oxyfluorfen at 0.125 kg/ha can be used for better weed control and higher seedling production in onion nursery