A study was conducted on a sandy clay loam soil at the National Agricultural Research Centre, Islamabad, Pakistan, during 2005 and 2006. The mustard (Brassica juncea) variety BARD-1 was treated with various -1 levels of Zn and Fe, (0-0, 0-1.5, 0-3, 2.5-0, 2.5-1.5, 2.5-3, 5-0, 5-1.5 kgha-1 and 5-3 kgha-1), respectively. A basal dose of 90N and 60P kg ha was applied, in the form of Urea and triple super phosphate (TSP) with Zn and Fe. The increase in Zn and Fe fertility from 0-1.5 to 5-1.5 kg ha-1 increased yield of BARD-1. The maximum yield response was recorded when 5 kg ha-1 Zn and 1.5 kg ha-1 Fe were applied. Beyond this level, no further increase in yield was recorded in any mustard traits. A positive correlation was recorded between seed yield and 1000-seed weight with the application of 5 kg Zn ha and 1.5 kg Fe ha in combination at the time of sowing. It can therefore be concluded that 100 % seed yield of mustard variety BARD-1 increased at 5 Zn: 1.5 Fe kg ha-1 as a result of increased pods plant, number of seeds pod and 1000-seed weight.