A model to simulate the development, growth and yield of irrigated sunflower

摘要: A simulation model of the development, growth and yield sunflower cv. Hysun 30 is presented. In model, crop rate a function radiation use efficiency, incident radiation, canopy extinction coefficient leaf area index. The efficiency was measured found to change during crop. It higher after floret initiation than before, reaches maximum at anthesis. changing has been incorporated into model. index each day number leaves produced duration expansion leaf. nitrogen plant population factor modulates through its effect on senescence this way concentration in density affect dry-matter accumulation by Crop dry matter end physiological maturity are used calculate components from relationships previously demonstrated greenhouse experiments. mean daily temperature affects production as well determining time phenological stages thermal time. Although developed for hybrid 30, it extended some other hybrids size activity generative producing florets floral meristem. simulated yields four close irrigated crops.