Canopy Structure and Photosynthetic Characteristics of Yongyou Series of Indica-Japonica Hybrid Rice under High-yielding Cultivation Condition Root System Morphological and Physiological Characteristics of Indica-japonica Hybrid Rice of Yongyou Series Some Characteristics of Mechanically Transplanted Pot Seedlings in Super High Yielding Population of Indica-japonica Hybrid Rice Yongyou 2640 Effect of Mechanical-Transplanting Density on Lodging Resistance and Yield in Different Types of Rice