Study on Cold-stress Tolerance of Transgenic Alfalfa (Medicago sativa L.) with AmDHN Gene Primary Study on Root System of Alfalfa in the Sowing Year Effects of Application of Zn,Fe,and Mo on the Alfalfa Yield and Their Contents and Absorption Amounts Ecological Adaptability of Alfalfa Varieties Investigated by Pot Experiment with Sandy Soil under Different Moisture Conditions Screening of High Efficient Symbiotic Rhizobium for Zhongmu No.1 Alfalfa Construction and Transformation of RNAi Vector of MsZFN Gene from Alfalfa (Medicago sativa L.) A Preliminary Study on Alfalfa Cultivar Identification Using SSR Markers Effect of Moisture Content,Degree of Bale Compactness, and Urea Preservation on Baled Alfalfa Hay Quality Effect of Selenium(Se) on Herbage Yield and Quality of Alfalfa EFFECT OF γ-RAY IRRADIATION ON in vitro CULTURE AND PLANT REGENERATION OF ALFALFA BIOLOGICAL EFFECTS AND RAPD ANALYSIS OF ALFALFA (medicago sativa L.) IRRADIATED BY FAST NEUTRONS Evaluation on the Ecoclimatic Suitability for Alfalfa Harvested Period in the Region of Yellow River Delta