Farm Yard Manure (FYM), Nitrogen (N) and its time of application plays an important role in crop productivity. To study its effect on maize, this experiment was conducted at Livestock Research and Development Station Surezai, Peshawar. Two levels of FYM (10 and 20 ton ha^-1) and three levels of N (100, 150 and 200 kg ha^-1) were applied at three application timings (AT), full at vegetative stage V6 (AT1), full at reproductive stage R2 (AT2) and ½ at V6 and ½ at R2 stage (AT3).  Overall one control was used in the experiment. Randomized complete block design was used with three replications. The studied parameters were significantly affected by FYM, N and AT of nitrogen. Days to harvest maturity (89), ear length (17.8 cm), ear weight (115.8 g), grains ear^-1 (390), thousand grains weight (257 g), green fodder production (kg ha^-1), biological yield (13647kg ha^-1), grain yield (5947kg ha^-1) and harvest index (35.5%)  had significantly affected when 10 t FYM ha^-1 was applied. Similarly, days to harvest maturity (89), ear length (17.8 cm), ear weight (115.8 g), grains ear^-1 (390), thousand grains weight (257 g), green fodder production (kg ha^-1), biological yield (13647kg ha^-1), grain yield (5947kg ha^-1) and harvest Index (35.5%) were significantly affected in plots treated at the rate of 100 kg ha^-1 with N. In case of AT, N applied full at vegetative stages significantly enhanced the ear length (17.8 cm), ear weight (115.8 g), grains ear^-1 (390), thousand grains weight (257 g), green fodder production (kg ha^-1), biological yield (13647kg ha^-1), grain yield (5947kg ha^-1) and harvest Index (35.5%) . It is concluded from the experiment that, 10 ton FYM ha^-1, 100 kg N ha^-1 along with its application timing full at vegetative stage significantly enhanced maize crop productivity and hence these factors are recommended for the agro climatic conditions of Peshawar.

Keywords: Application time, FYM, Maize, Nitrogen, Yield components.