Wheat is the most widely grown crop in the world and is sown over a wide range of sowing dates in various cropping systems. Sowing time as a crop management tool played a significant contribution towards the wheat grain yield, reflecting the importance of the selection of optimum sowing time. The genotypes also behaved variably. This book, elucidated some important parameters that can be used as yield predictors of the crop. To further clarify, a validated APSIM model was used for understanding and analyzing optimum sowing time, genotype and climatic behavior. The simulation results explained the vulnerability of crop and a relationship of climate and wheat yield variability. The book, therefore, depicts the successful use of the simulation approach to understand crop bio-dynamism, climate and crop management simultaneously to explore the potential yield of wheat in a given environment.