Effects of Postponing Nitrogen Application on Grain Filling Characteristics and Yield Components of Winter Wheat Suffered Waterlogging after Anthesis Physiological characteristics of grain filling in high quality winter wheat under different fertilizer application dose and plant density Effects of Exogenous ABA and 6-BA on Protein Content and Grain Filling Process in Different Types of Stay-Green Wheat Effects of Wheat Straw-Residue Applied to Field and Nitrogen Management on Photosynthate Transportation of Stem and Sheath and Grain-Filling Characteristics in Super Hybrid Rice