Field investigation carried out at Rajasthan College of Agriculture, RAU, Udaipur during winter seasons of 1993–94 and 1994–95 revealed that pre-emergence application of oxadiazon 0.5 kg/ha to Indian mustard controlled the weeds most effectively and significantly reduced their density and dry matter at 30, 60 and 90 days after sowing (DAS) and at harvest. Minimum uptake of NPK and S by weeds was also recorded under the influence of oxadiazon. Consequently highest uptake by crop was registered in oxadiazon treated plots. Sulphur application had no significant bearing on weed density but weed dry matter increased significantly upto 60 kg S/ha. Application of 60 kg S/ha also resulted in significantly higher NPK and S uptake by weeds and crop.
