Field experiments were carried out during 2009-10 and 2010-11 at Mountain Livestock Research Institute, Manasbal, Sher-e-Kashmir University of Agricultural Sciences and Technology Kashmir, India to find out the suitable weed management practices and cropping system of fodder oat. The green fodder yield and dry matter accumulation of oat was significantly higher under oat sole than oat + vetch (2:1) and oat + vetch (1:1), however was at par to oat + vetch 4:1. The magnitude of increase in green fodder yield with oat sole was 0.96, 12.71 and 15.51% than 4:1, 2:1 and 1:1 cropping system, respectively. Application of pendimethalin 0.75/ha recoded 7.76, 24.46 and 98.6% superiority over application of butachlor 2 kg/ha, wheel hoe and weedy check, respectively. The oat sole with application of pendimethalin 0.75/ha recorded highest gross profit (Rs. 76,903/ha), net returns (Rs. 49,363/ha) and B:C (2.79) than other treatment combination.