Study on the special-temporal dynamics of winter wheat water use efficiency and evapotranspiration under bunch planting and plastic film mulching with soil on flat field during the whole growth season Evaporation and Transpiration in Farmland Cloning and Expression Analysis of Soybean Homoserine Kinase (GmHSK) Gene at the Whole Growth Period Drought-resistance Identification of Dongxiang Common Wild Rice (Oryza rufipogon Griff.) in Whole Growth Period