Response of Maize Cultivars to Various Nitrogen Levels

Studies pertaining to the effect of different nitrogen rates on the yield and yield components of maize cultivars (Azam and Jalal), was conducted at the New Developmental Form of The University of Agriculture Peshawar, during summer 2011 using Randomized Complete Block Design (RCBD) with split plot arrangement. The treatments comprised 0, 30, 60, 90, 120, 150, 180 and 210 kgNha-1 assigned to main plot and maize cultivars (Azam and Jalal) to sub plots. Results revealed that maximum grain ear-1 (383.2), grain yield (3747.41 kgha-1) and harvest index (27.66%) were recorded in Azam cultivar. However maximum ear length (16.33 cm), biological yield (14250 kgha-1) and thousand grain weight (258.65 g) were observed in Jalal cultivar. Maximum biological yield (16277.78 kg ha-1) was recorded with the application of 180-210 kgNha-1. However maximum ear length (17.18 cm), grain ear-1 (411.32), grain yield (4888.9 kgha-1) and thousand grain weight (264.96 g) were observed with the application of 180kgNha-1.