CORRELATION BETWEEN THE DISTRIBUTION OF PHOTOSYNTHATES OF FLAG LEAF AT FULL HEADING STAGE OF MAIN CROP AND YIELD OF POLINGENESIS RICE Relationship between Vascular Bundle System of Rachis and Rachilla and Ear Productivity in Wheat Modeling Formation of Yield Components Based on Apical Development in Wheat A Simulation Model for Yield Components and Final Yield in Winter Wheat The efect of dimatic elements on the grain number per spike of winter wheat