[en] A field experiment was carried out during the dry season of 1972 at Muara Experimental Station of the CRIA at Bogor. The objective of the experiment was to further study the optimum time of nitrogen application and its effect on yield components as well as the yield and on the distribution of absorbed fertilizer N in Pelita I/1 rice variety. N 15 labelled urea fertilizer was used in the experiment. TSP at a rate of 60 kg P₂O₅/ha and muriate potash at a rate of 30 kg K₂O/ ha were used as basal dressing. Nitrogen fertilizer applied at a rate of 100 kg N/ha had affected the yield of grain, straw as well as the plant. The highest yield was derived from a two split doses of (25-75) kg N/ha, applied at transplanting and either at primordia or at mid point in time between 21 days after transplanting and primordia respectively. Yield components might also be affected by urea application, however no significant effect was found on the number of grain per panicle. In line with the yield potential, the N total of rough grain was the highest when urea was applied in two split doses of 25 kg N/ha at transplanting and 75 kg N/ha either at mid point or at primordia. The percentage of fertilizer N utilized by Pelita I/1 rice variety was in the range of about 32,058,0%. (author)