The experiment was conducted at Agronomy Research Farm of Sher-e-Kashmir University of Agricultural Sciences & Technology of Kashmir during kharif season 2012 to study the effect of water regimes, plant densities and butachlor on the performance of transplanted rice (Oryza sativa L.) under temperate conditions. The experiment was laid out in split plot design assigning combination of water regimes, plant densities and weed management practices with three replications. The yield attributes viz., panicle length, panicle weight, spikelets panicle-1 and grains panicle-1 were significantly higher under 44 hills m-2 plant density, 5 cm and 10 cm water regime. As far as weed management practices are concerned, Butachlor (apart from weed free) caused significant improvement in crop growth and yield attributing characters. Leaf area index (LAI) was significantly higher for 55 hills m-2 plant density, 5 cm and 10 cm water level and Butachlor weed control treatment. The NPK uptake by weeds was significantly lower at 44 hills m-2 plant density, 15 cm water regime and Butachlor weed control (other than weed free). However, 15 cm water regime also enhanced NPK uptake by crop plants also.