In this book there are 11 chapters related to biological nitrogen fixation, regulation of legume-rhizobium symbiosis, and agriculture and ecology of biological nitrogen fixation, including new models for autoregulation of nodulation in legumes, endophytic nitrogen fixation in sugarcane or forest trees, etc. The book will contribute to biological, ecological, and agricultural sciences.

Biological nitrogen fixation has essential role in N cycle in global ecosystem. Several types of nitrogen fixing bacteria are recognized: the free-living bacteria in soil or water; symbiotic bacteria making root nodules in legumes or non-legumes; associative nitrogen fixing bacteria that resides outside the plant roots and provides fixed nitrogen to the plants; endophytic nitrogen fixing bacteria living in the roots, stems and leaves of plants.

Contents
Preface
1 Nitrogen Fixation Outside and Inside Plant Tissues
2 Nitrogen Fixing Cyanobacteria: Future Prospect
3 Nitrogen Fixation in Sugarcane
4 Autoregulation of Nodulation in Soybean Plants
5 Systemic Regulation of Root Nodule Formation
6 Effects of Phytohormones on Nodulation and Nitrogen Fixation in Leguminous Plants
7 Impact of Harsh Environmental Conditions on Nodule Formation and Dinitrogen Fixation of Legumes
8 Comparison of Soybean-Nodulating Bradyrhizobia Community Structures Along North Latitude Between Japan and USA
9 Effects of Rhizobium Inoculation on Nitrogen Fixation and Growth of Leguminous Green Manure Crop Hairy Vetch (Vicia villosa Roth)
10 Role of Boron Nutrient in Nodules Growth and Nitrogen Fixation in Soybean Genotypes Under Water Stress Conditions
11 Symbiotic of Nitrogen Fixation Between Acid Aluminium Tolerant Bradyrhizobium japonicum and Soybean

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