[en] Nitrogen concentration as well as uptake of N in different plant parts and whole plant increases by top dressing and foliar fertilization of N in nodulating as well as non-nodulating isolines, the effects being more conspicuous with respect to uptake in non-nodulating Lee. A maximum of 177.4 kgN/ha was accumulated by nodulated crop when fertilized with 20 kg starter, 20 kg top-dressed and 80 kg foliar applied nitrogen. Non-nodulated crop accumulated 161.4 kg N/ha when fertilized with 80 kg as basal, 20 kg as top-dressed and 80 kg as foliar applied N. Fertilizer N utilization ranged from 8.45-26.37%, depending on the nodulating nature of the isoline and rate and method of fertilizer N application. Utilization of foliar applied N was better than that of top-dressed. Symbiotic N fixation for nodulated crop receiving 20 kg starter N was 72.80 kgN/ha. Foliar spray increased the symbiotic N fixation, as did top-dressing, whilst a combination of the two reduced fixation