Analysis on Population Characteristics and Yield Formation Advantages of Pot-seedling Mechanical Transplanting Middle-season Indica Hybrid Rice Effects of Sowing Density, Fertilizer Amount in Seedbed and Seedling Age on Seedling Quality and Grain Yield in Paddy Field for Mechanical Transplanting Rice Effect of Seedbed Soil Fertilizing for Mechanical Transplanting Rice Seedling Response of yield, quality and nitrogen use efficiency to nitrogen fertilizer from mechanical transplanting super japonica rice. Some Characteristics of Mechanically Transplanted Pot Seedlings in Super High Yielding Population of Indica-japonica Hybrid Rice Yongyou 2640 Influences of mechanical sowing and transplanting on nitrogen accumulation, distribution and C/N of hybrid rice cultivars Characteristics of Nitrogen, Phosphorus, and Potassium’s Uptake and Partitioning in Mechanical Transplanting Japonica Rice