Simulation of Effects of Water Stress and Nitrogen Levels on Yield and Yield Components Corn

Water and nitrogen are the most important parameters affecting the yield of different plants such as corn. The aim of this study was to investigate the response of field corn to different levels of water and nitrogen and simulating with Aquacrop model. Water treatments were included control (I100), water stress in vegetative growth, flowering and grain filling stages, each of them had two levels 80% and 60% of water requirement and application of nitrogen fertilizer in two levels of 220 (N100) and 110 (N50) Kg N/ha. Field results showed that various stages of crop growth was affected by water and nitrogen stresses.The results of analysis of variance showed that various water and nitrogen treatments had a significant effect on above ground biomass and grain yield at 1%. AquaCrop model was able to accurately simulate canopy cover, biomass and grain yield during the growth season. Simulation results showed that calibrated AquaCrop model can be used to a wide range of Iran.