INTRODUCTION Most fertilizers add nitrogen to the soil. This can be done via chemical fertilizers, or through a process called biological nitrogen fixation (BNF). On a worldwide basis it is estimated that about 175 million tons of nitrogen per year is added to soil through biological nitrogen fixation (BNF). The term bio means living; so biofertilizers refer to living, microbial inoculants that are added to the soil. These biofertilizers are products consisting of selected and beneficial microrganisims, which are known to improve plant growth through supply of plant nutrients. Biofertilizers include environment-friendly fertilizers with organisms such as: (a) Rhizobium strains for legumes, (b) Azotobacter strains for nonlegume crops, (c)Azospirillum, (d) Blue Green Algae, (e) Azolla. (f) VAM strains for use in agriculture, horticulture, and plantation crops, and (g) phosphorus solubilizing bacteria (PSB) - phosphorus dissolving bacteria strains. Most common among these are symbiotic mycorrhiza and Rhizobium members, which deliver plant nutrition, disease resistance, and toler......

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