Effects of the addition of mineral nutrients on biological nitrogen fixation in forest ecosystems Isolation and Biolog identification of the high-efficiency azotobacter from iron tailing under different vegetation restoration modes INVESTIGATIONS ON THE SUBMICKOSCOPIC STRUCTURE AND NITROGENASE ACTIVITY OF STEM NODULES IN Sesbania rostrata EFFECT OF HIGH TEMPERATURE ON NITROGENASE ACTIVITY OF BLUE-GREEN ALGAL Anabaena 7120 Preliminary Studies on Endophytic Diazotrophs from Neyraudia reynaudiana and Cynodon dactylon Isolating Endophytic Diazotrophic Bacteria from Three Xerophil Gramineae Grasses to Determine Their Nitrogen Fixation and Plant Growth-Promoting Effects of Phosphate Levels and Rhizobium Inoculation on the Root Morphology and Nitrogen-fixing Characteristic of Alfalfa Effect of wetting duration on nitrogen fixation of biological soil crusts in Shapotou, Northern China Effects of Different Phosphorus Levels on Photosynthesis and Root Nodule Nitrogen-fixing Characteristic of Alfalfa Effects of cooperation between associative azotobacteria and rhizobia on wheat seedling Isolation and identification of endogenic nitrogen-fixing bacteria in the roots of Jerusalem artichoke (Helianthus tuberosus) Changes of Nitrogenase Activity in Sugarcane (Saccharum officinarum L.)and Its Response to Innoculate Nitrogen Fixation Bacteria RELATIONSHIP BETWEEN NITROGENASE ACTIVITY EXPRESSION AND PHYSIOLOGICAL CONDITIONS IN BLUE-GREEN ALGAE ANABAENA 7120 NITROGEN FIXATION OF BLUE-GREEN ALGAE Anabaena 7120 UNDER OSMOTIC STRESS COMDITION Study on Several Nitrogen Fixation Strains from Phyllostachys pubescens Roots PLANT GROWTH, NODULE NITROGENASE ACTIVITY AND PHYLLODE NUTRIENT CONTENT IN ACACIA MANGIUM Nitrogen fixation ability of azotobacter and its effect on growth of spring wheat Study on the Difference of Nodule Nitrogenase Activity and Amount of Nitrogen Fixation of Different Soybean Varieties Studies on the Nitrate Reductase Activity (NRA) and the Nitrogenase Activity (NA) in the Nodules of Groundnut (A.hypogaea L.) Effect of boron deficiency on structure and nitrogenase activity of nodules in soybean plants Nitrogen fixation potential of biological soil crusts in southeast edge of Tengger Desert, Northwest China. Nitrogen-fixation Potential of Nodules in Four Types of Nitrogen-fixation Plants and Their Influencing Factors in Dry-hot Valley Growth-promoting Effects and Physiolog ica l Property of Endophytic D iazotrophsIsola ted from Guangdong Bamboo ( B am busa blum eana ) Effects of molybdenum on nitrogenase activity of nitrogen-fixing bacteria in sugarcane Effects of the iron nutrition on nodule development and nitrogen-fixing functions of peanut THE DISCOVERY AND PRELIMINARY STUDY ON NITROGEN-FIXING BACTERIA FROM THE ROOTS OF MASSON PINE SAPLINGS Nitrogen fixation potential of biological soil crusts in Heidaigou open coal mine, Inner Mongolia, China. Effects of the NO3--N on nodule formation and nitrogen fixing of peanut