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Abstract
Rhizobacteria are referred to as Plant growth promoting rhizobacteria (PGPR) which exert useful effects upon plant development and growth. When inoculated by the PGPR, ornamentals, forest trees, vegetables and farm crops may lead to several positive results such as plant growth in early season, improvement in seedling germination, plant health and plant height, shooting weight, nutrient content of the shoot, early flowering, increase chlorophyll content and increased nodulation in legumes.These bacteria help to improve the fixation of N2 in legumes, to encourage number of bacteria that fix nitrogen freely, to increase nutrient supply such as phosphor, sulfur, iron and copper, to produce plant hormones, to improve other beneficial bacteria or fungi in nearby area, and to control fungal, bacterial and insect phytopathogens.