1Studies on the Main Photosynthetic Characteristics of Flag Leaf in Winter Wheat on Huanghuai Plain3-6
11Current situation of research and development of microorganism fertilizer and its application prospects34-36
13Studies on the Protogenic Resistance to Antibiotics of Several Kinds of Nitrogen-fixing Bacteria,Phosphobacteria and Silicate Bacteria40-42
14Exploration on methods of breeding nitrogen-fixing bacteria and phosphorous-potassium bacteria by utilizing electrofusion technique43-45
15Preliminary Identification of Strains after the Separation and Purification of Nitrogen-fixing Bacteria46-49
20The Effects of Dietary VA Levels on Some Serum Biochemistry Indexes of Laying Hens under Stressed Condition62-65