Abstract
A field trial to see the effect of different rates of nitrogen at a constant level of phosphorus on growth, grain yield and quality of maize (Zea mays L.) was carried out on a sandy clay loam soil having 0.04% total N, 14 ppm available P and 212 ppm K. Nitrogen and phosphorus levels were 0-0, 75-75, 150-75 and 225-75 kg NP ha-1. The two new genotypes UM-6 and UM-31 were tested against variety Akbar. The results showed that the highest grain yield of 55.03 q had was obtained with the ap-plication of 225-75 kg NP ha-1 and UM-31 yielded higher than either Akbar or UM-6. Leaf area index also increased with the application of fertilizer. Similarly protein and oil contents were higher in variety UM-31 with the same dose of fertilizer com-pared to other treatments.
