The experiment was conducted to determine the effect of different irrigation levels (L0, L50, L75 and L100) from field capacity and four nitrogen rate (0, 50, 75, 100 kg ha-1) on wheat genotypes during (2017-2018). The experiment units were laid out in Randomize Complete Block Design (RCBD) arrangement in a split plot design with irrigation in main plots and nitrogen in sub plots with three replications.
The results revelated that, plant height, leaf area, weight of grain/spike, number of seeds spike-1, 1000. grain weight and grain yield were significantly effected by nitrogen and irrigation levels over control. The results also showed the maximum yield and yield components was obtained from nitrogen applied 75 and 100 kg ha-1 . From irrigation, the results was found that the tallest plant (76 cm) , leaf area (155.83 cm2), highest seed weight (9.52 g), number of seed spike-1 (60.36), 1000-grain weight (46.22 g) and highest grain yield (93.88 g) were obtained with irrigation 100% from field capacity. The yield and yield contributing characters were more affected due to application of different irrigation and nitrogen levels and maximum grain yield was obtained by L100 and 100 kg ha-1 and giving 103.23g.
Also the results showed highly positive related between nitrogen and seeds weight 5 spikes, 1000- grain weight and weight of seeds with values 0.929, 0.922 and 0.893 respectively, while the relationship with irrigation gave highly positive relationship with number of seed spike (0.958), weight of seeds (0.931), flag leaf area (0.911) and seed weight in spike with value 0.902.
We conclude that the optimum grain yield was produced in supplemental irrigation (L100) and nitrogen rate of 100 kg ha-1. The results indicated that the irrigation and nitrogen levels would be most advantageous for wheat production